I'm on the hunt for ROMS for old systems. NES, SNES, Genesis, etc.

I paid for a physical copy of Micro Mages for NES a few years back, and just recently bought the ROM for Dataman, also for NES. But I'm wondering if anyone has a source for several that fit this category.

Let me be clear, I will gladly support the developers of these games, but I have been bitten by a few stinkers. Where the trailer looked good but the game didn't feel like it was worth the $10+ for the ROM.

One in partiular that has intrigued me is Courier. I did some searching and can't find a demo or a ROM to try before I buy. And at $10, it's outside of my impulse buy range, if that makes sense.