PC to NES cable, yes, I've got 4 of them ready to ship right now.
SNROM cart, no, but if you can send me one or are willing to pay for buying one I could go for it.

I mean, of course I've got SNROM games, but I'm pretty attached to all of them. Maniac Mansion, Kid Icarus, Zelda, Spot, some of my favorite games. heheh.

Does say, $35 sound fair? (assuming a cart would be supplied seperately) That's like $20 for the adapter, $15 for the modded cart. Might be kinda costly for only running 8kB programs. I could probably add a battery if there isn't one already, for the cost of parts ($2 or $3), if that's important also.

My new cart design would be a lot more bang for the buck, it just can't be ready soon enough though. Perhaps before the end of this year, if everything goes smoothly (and I mean very smoothly, heheh).