Hmm, Amazon has the Super UFO Pro 8 for ~ $50 shipped:
http://www.amazon.com/Saves-Backu...
That's too bad the coprocessor thing doesn't work well (and the saving issue either, thanks for the heads up on that!). If it did, it'd be one of the better flash carts!
I did some more digging, and infiniteneslives is releasing a reprogrammable flash board that can support up to 128Mbits, as well as Hi/LoROM:
http://www.infiniteneslives.com/a... It still needs to be set up with his reader/writer, but that's only ~$25, so I think I'll go with this option. It'll end up being around $60 shipped, and I know the guy does quality work, so I'll give that a go. Looks like it can only do one game at a time (which is totally fine with me), but the extra memory should put its compatibility ahead of the Everdrive. Thanks for all the input guys!