If you're really enjoying yourself and want to get real carts still though, one might be interest in going Japanese, all it takes is a honeybee converter or some other same same device. I've got 3 cheap NES/SNES games that are decent if you're interested -- Tag Team Wrestling and Rush'n Attack (NES arcade conversions) and Hyperzone (by HAL, who made Kirby etc, kind of like f-zero and starfox in one.)