As the title says; how much is a sealed super contra worth ?

I would think that game sealed would be quite common.  The thing working for you is the fact that it is a very popular title.  Very hard to price...taking a shot at the door when I say $140

Thx ! And does anyone have any idea how many games (cart only) I should offer for this sealed Super Contra + loose Action 52 (With scratches on the cart)

We currently have a deal for 30 loose carts but he is gonna close the bidding tomorrow and I am expecting bigger offers from other members. How many games should I max. offer ?

depends on what games you are offering.

yes be careful Kenny esp on the carts that you are putting up as offer bait...if you don't know their value post em and im sure we can help you out

I'd have to disagree with that. I'd say it's worth closer to $80-100.

As you can see in the "Finder Keepers" forum, I already did the trade.

The games where:

Kirby's adventure
Gun.smoke
Four player tennis
Excitebike
Double dragon
Castlevania
Boulder dash
Bram Stoker's Dracula
Bart simpson vs the space mutants
Paperboy
Puchout (mike tyson's)
Rad Racer
RC Pro AM
Robocop 2
Tennis
Tetris
Turtles 2
Zelda
Xevious
Track and field 2
Robowarrior
rygar
RC Pro AM
Festers quest
Defender of the crown
Adventures in the magic kingdom
Bad dudes vs Dragonninja
Battle of olympus
Captain Comic
Ivan "ironman" Stewarts Super Off road
Gremlins 2

and I threw in 5 common games with bad labels

Nothing rare IMO.