I've had luck in a couple of LBS ... ask them what old seats they have around that they've pulled off of bikes ... some are OE that someone didn't want. They'll give them or sell for $10 usually. There's a basic Velo racer seat that seems to be ubiquitous on entry road bikes that is padded but not much. Also Performance has a housebrand seat that is racer hard ... but that is $40 or more I think.
Good Luck!
Cool Bike!