Standard painted hard tops seem to go for between $500-$1500 from what I've seen, depending on condition. Vinyl covered hardtops are more difficult to come by due to far lower production totals. Last summer at Corvettes at Carlisle, I nearly bought a vinyl covered hardtop in great shape for $800. I've been kicking myself ever since, but I had no way of transporting it and decided I wouldn't actually use it much, if at all, plus the problem of storing it properly.

Just to add to the price, I recently handled the purchase of a C4 hardtop for a friend in Florida. Top was in Illinois near me. Properly crated for shipping, it cost $320 to ship plus about $60 for crate materials(plus my time and gas). And the shipping price was a bargain compared to some other shipping quotes.    Hope it's nearby to you so ya can pick it up!  Mike