To be fair Forte, I think the majority of what you're offering is being sold at a fair price. Mega Man X complete for $33, Mega Man 2 complete for $32.00, etc
It's just a couple of them that seem a bit funky, especially compared to the others.
I would recommend maybe dropping the Mega Man V cart to $55-$60 shipped. For most people, the cart is all they could ever want or need, and it's not THAT much higher than its original MSRP, plus it's the only Gameboy Mega Man game to not be a port of a NES game, so it's definitely something worth demanding.
Now $158.00 for a complete NES copy of the original Mega Man... this is somewhat reasonable. I would still drop it to $150 shipped, again not a huge drop but it's sure to get a little more attention that way.
Mega Man 3, considering it's a rare copy, can be dropped to $100 shipped.
Other than what I mentioned, I don't think anything else needs changing. Some people might rag on you for Legends disc only, but I personally think you offering a custom case is genius, since jewel cases break easily. You should offer custom cases for the GBA games for an extra fee.