Welcome to my recycled WTB thread.
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Update #11
I'm looking for the screw variants I don't have. SE is there, but I don't even have a 3 screw copy, so I doubt that one is in my price range. I will pay you a premium for your cart, unless it's really, really, REALLy beat-up, and even then I'll still probably pay you a premium, just not as much. These are games with known copy(ies) out there that I still need:

Adventures of Bayou Billy, The (5 Screw)
Base Wars - Cyber Stadium Series! (5 Screw)
Castlevania II (5 Screw)
Castlevania III (5 Screw)
Contra! (5 Screw)
Defender of the Crown (5 Screw)
Jackal (5 Screw)
Metal Gear (5 Screw)
Q*Bert (5 Screw)
R.C. Pro Am (5 Screw)
Rollergames (5 Screw)
Silent Service (5 Screw)
Skate or Die (5 Screw)
Skate or Die II (5 Screw)
Ski or Die!  (5 Screw)
Snake's Revenge (5 Screw)
Stadium Events (5 Screw)
Tiny Toon Adventures (5 Screw)
Top Gun 2: The Second Mission (5 Screw)
 
These guys haven't been found yet, but I hold out hope:
Mission: Impossible (5 Screw)
Nightshade (5 Screw)
Pirates! (5 Screw)
Star Trek 25th Anniversary (5 Screw)
Batman Returns (5 Screw)
Blades of Steel (5 Screw)
Bucky O'Hare (5 Screw)
Contra Force (5 Screw)
Jack Nicklaus' Greatest 18 Holes of Major Championship Golf (5 Screw)
Jackal (5 Screw)
King's Quest V (5 Screw)
Laser Invasion (5 Screw)
Lone Ranger, The (5 Screw)
Mission: Impossible (5 Screw)
Monster in My Pocket (5 Screw)
NASCAR Challenge, Bill Elliot's (5 Screw)
Nightshade (5 Screw)
Pirates! (5 Screw)
Star Trek 25th Anniversary (5 Screw)
Rush'n Attack (5 Screw)
Tiny Toon Adventures 2 - Trouble in Wackyland (5 Screw)
Tiny Toon Adventures Cartoon Workshop (5 Screw)
Zen - Intergalactic Ninja (5 Screw)
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Update #6
Call me Gwyndion The Second, because this is about to get crazy. I'm looking for Homebrews and Repros. Really specific ones. I'll start off slow, then ease my way into this one. Consider myself eased, as this is all that is left...

NES
Free Fall, NGD Edition    <--- Secret Santaed 2013. Thanks, Kevin and Gwyndion!
Grimalkin Ice Hockey
MGC 2011
Retro Gathering 2010

For Game Boy Advance
Anguna
Blast Arena
Christmas Double Pack
Pikilipita
Reaxion
Thrust

For Virtual Boy
Virtual Fall
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Update #9
Yep, Timewalk. Adding them to my wants.

SNES Timewalk Titles - Mario Kart R

NES Timewalk Titles - Sweet Home (Capcom Proof)
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Update #2
I'm looking for sleeves. The good ones. I need the blue sleeves that came with the Color Dreams games, the Tengen sleeves, the Bible Adventures sleeves, Funcoland sleeves, and some Retrozone sleeves. Seems like a pretty tall order, but I'll take them one at a time if need be. Not sure what to offer on these... I don't need that many, so starting offer will be at least over $1. EDIT: That's for anything but Funco sleeves. I'm sorry, but I don't see those as being rare in any way, shape, or form.

ACE                                  
AVE                                   3/18
Color Dreams                       6/20
Funcoland
Nintendo (Red Foil)             
Retrozone
Tengen
Wisdom Tree                      5/7
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Update #7
I am now looking for some carts that may or may not exist. "Why add them, then?" you might ask. Well, the fact that I've seen a 3 screw Gumshoe gives me hope that some of these might be out there as well, even if it is just the one error cart. $100 offer for any of the carts below.

*Chubby Cherub, 3 Screw    <--- May not exist
*Clu Clu Land, 3 Screw         <--- May not exist
*Karnov, 5 Screw                  <--- May not exist
*M.U.S.C.L.E., 3 Screw         <--- Exists?
*Soccer, 3 Screw                   <--- May not exist
*Sqoon, 3 Screw                    <--- May not exist
*Stack-Up, 3 Screw               <--- May not exist
*Stinger, 3 Screw                    <--- Exists
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Update #5
Title says it all. Bounty of $1000 for a Contra Prototype. I thought it would be cool to own a proto and talked to Dream (which prompted his big sale?). When he asked what I wanted, at first I just said something cheap. But when I thought about it, Contra popped in my mind. Unfortunately, he doesn't have one. 

So, lots of money to the person that can sell me one.
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Update #1
I'm 14 1 licensed games, 6 5 unlicensed games, and 8 variants away from completion. Not in a hurry, but am looking for some help getting the last of these titles.

Licensed
Best of the Best Champ Karate
Chip and Dale Rescue Rangers 2
Danny Sullivan's Indy Heat
Die Hard
Digger T Rock
Flintstones Surprise Dino Peak
Gemfire
Godzilla 2 War of the Monsters
Kid Klown in Night Mayor World
Little Samson
Snow Brothers
Stadium Events
TMNT Tournament Fighters

Unlicensed
Bubble Bath Babes
Caltron 6-in-1
Castle of Deceit
Challenge of the Dragon
Hot Slots
Maxi 15
Menace Beach
Myriad 6-in-1
Operation Secret Storm
Peekaboo Poker
Secret Scout

Variant
*Donkey Kong Jr Math, 3 Screw
*Gotcha, 5 Screw
*Indiana Jones Crusade, Ubisoft
*Mario Bros, 3 Screw
*Megaman, 5 Screw
*Mike Tyson's Punch-Out, 5 Screw
*Star Force, 5 Screw
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Update #3
I've got a hankering to finish off my Retrozone collection. There are just a few titles I missed out on, as they were already discontinued when I got into homebrews. Looking for the following games:

Exerion 1+2  <--- Thanks to Braveheart69!
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Update #11
Gamecube broadband adapters, I need them. At least four. Going to be used, so condition does not matter, nor does any packaging. Can even be Japanese. 
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Update #10 - Uncompleted
Campout Retrozone title. I'm looking for them. Help me out, someone knows who has these...
Retrozone Final Fantasy V - $500 bounty
Blade Buster
Dragon Quest V 
Dragon Quest VI
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Update #8
Hudson shooting clock. Wicked Wonka brought one over while doing tile work at my house and I'm addicted. This thing is fun!
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Update #4
I'm looking for a dozen nice copies of Lee Trevino's Fighting Golf for a project I'm working on. Anyone have a bunch they'd like to unload?

Currently at 12/12
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Original Post - FOUND!
WTB: 8-Bit Xmas 2011 for SNES
Bounty of $85

It's the only copy of the Xmas games and I didn't have the extra $50 last year to buy. Now I'm kicking myself. Just missed one on ebay, been looking for a while, but constantly missing out. So, help a duder out.