I had Flintstones King Rock Treasure Island for the GB when I was a kid. I have about 30ish GB games now that I'v picked up from garage sales, etc. I have yet to see it at any game stores in the 4 years since I've started collecting again. It goes for 45ish loose and over $350 cib. $20 is my limit for GB games though, so unless I find one at a garage sale, I'll probably never buy it. What's the story behind this game? Other than the obvious that it's rare, but hats the deal? 

It's uncommon and fun. That's it.

Most GB games are a big leap from loose to CIB, nobody kept the boxes. If you really want it 45 isn't that much to spend fora game from your childhood. I feel bad for kids who grew up with little Samson, good freakin luck

Just wait. I just got into GB stuff and have found the prices to be all whacky on GB stuff. I just got a copy for cheap in a store. I think your best bet is to hope to find one in a store, they seem to be marked much lower because A) very few GB buyers and B) not knowing the price.

If you REALLY want it, the Euro version I think is cheaper and is probably identical. The GB games are region free and will all run normal speed

I've seen it twice 2 game stores. I bought it several years ago for $5 at a store. I saw it the other day for $17. I would pay the $45 for it though if you really want it.

$45 doesn't seem bad for a loose version of a valuable game.

There is a big price gap between GB games CIB and loose. Even with common titles. If it's an overly popular game, the gap got even bigger.

I'll echo everyone else here, $45 isn't bad if it's a game you grew up with and have an itch to play. I found it for $40 w/shipping currently listed, and all the cart only copies (no box, no manual) finished for $30 and under.