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You'll be lucky to find a buyer who just wants a front set. He/she might be looking for a set if they got curb rash on their current rims but even that's a stretch. I'm thinking maybe $200 a rim but you also have to take in account it's going to be another $25-40 a rim to ship.
Your best bet, list one at a time on eBay and the Corvette forum.
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.