Ebay. Mmmmmm....cheap.
http://cgi.ebay.com/ebaymotors/ws/eB...tem=2457382096
If you get a clutch with better grip without having engine modifications that requrie it, you'll just be transferring wear from the clutch to other drivetrain components which are definitely more expensive.
Oh, forgot to mention. I have a '95 Geo Prizm (identical mechanically to Corolla) and have done lots of work on it, so if you have any questions, PM me.