OP-1/OP-2 expansion

Does anyone know where an OP-1 or OP-2 board can be found for the SP-808? I've seen people on this forum who've bought it for $75 from zzounds.com. I contacted zzounds and they said they don't expect to ever carry the boards again. DANG!

I've found the board a couple places on the web, but they're asking between $250 and $350. I simply can't pay that much.

If anyone knows where to find a cheap expansion, please notify me.

Thanks.