Thats kind of a loaded question.  Boxes and manuals for common games do not hold much value on their own (which is the main reason I usually won't sell them because they are usually worth more to me than the market bares).  I would say to straight sell a common manual it is worth $0.50-$1.00 and a common box your probably pretty accurate $2-$4.  On the other hand if you take a cart only game thats worth $1-$2 and make it complete it will make the game worth in the $10 range.  The biggest reason I can see for the jump in price is the convienence of buying the game complete without having to track down any parts of the game on your own.

Bryan

Yeah, i know this is a totally loaded question. I was just kinda wondering if there was a reference based on the rarity of the game to decide the value of the manual, box, and maps (if there are any). But also I know that some game's boxes are just way harder to find than others but the actual cart isn't any more rare. Prices get blown WAY out of proportion on ebay, with all those people hungry for cib's. Sometimes I have a hard time justifying the cost on top of the ridiculous prices for shipping. If anyone else has any pointers I would appreciate it so much.

I guess its all about how much you're willing to pay for it.

Manuals are generally worth about helf the value of the game, or less.  And that goes for some of the harder to find games too.  A loose Snow Brothers manual sold at general auction a few months back but only brought in $20, when the game itself typically brings in around $50.  Even a Stadium Events manual I can't see breaking $500 on eBay, when the game is worth around $800 now.

As for boxes, they're typically worth close to the value of the game, maybe a little less.  I generally pick up loose boxes at around $2-3/piece in lots.  The thing is thought that loose boxes are not worth very much by themselves.  There are many many boxes that are exceptions to this rule, particularly the harder to find and more valuable games.  The value of boxes are a lot more complicated than manuals to say the least.