About a year ago we got our first mom & pop type game store EVER in my area. I've been to the store a grand total of 3 times over the last year and haven't bought a single thing and much of it has to do with prices on older stuff being much like your situation, $5 and up so I guess something like Bases Loaded would be $5.
No prices on anything you have to ask and the guy who then looks it up on his computer and gives you a price. He tells me that he charges what "his program" says it's worth plus shipping (or what shipping would cost you if you were buying online so I'm guessing + $4) so it always ends up being more then I could find it for online shipped. Last time I was in I checked the price on a cart only copy of Sagaia (Jap) for the GameBoy and he was asking $10 out the door, I would have bought it if it was $5.
In past trips I saw Earthbound - $85 (serious label damage) and a 2600 with a dozen games or close to for $150! I also saw Chuck Rock II cart only for the Genesis last visit and have been wanting to grab the Genesis or SNES Chuck Rock games if I saw them cheap but I would have been lucky if he was asking $5, probably would have been $7-8 and I would only want to pay $3 tops for it cart only.