When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I have checked with all the Corvette Vendors, Local Parts Stores, Summitt, NAPA, Rock Auto, GMParts Drirect, and no luck. Everyone wants to sell the complete unit.
I got a clutch slave at an O'Reilly autoparts for ~$75 - it was in stock and still open at 10pm on Saturday night when I needed it!! Not a tough job but it can be tight getting under there between the headers and bellhousing. Flush the fluid well and replace it with DOT 4 fluid so you have a higher boiling point.
A Dealership may have them now as well: NOS GM Clutch Hydraulic System Actuator (slave) cylinders (GM P/N 12509313)