The total cost for everything you will need including the center, left, and right outer molding plus the weatherstrip retainers for left and right A pillars will set you back about $525. The new parts come with sticky foam rubber-like sealing material attached to them which is probably missing or destroyed on your old parts. If you don't want water leaks around the A pillars you should really consider replacing these parts. Once they are bent up your chances of getting them to seal properly are slim.
The dealers can get them but the parts department people that I have dealt with were pretty clueless about how the windshield trim is constructed. You can also try TLD, I have bought several pieces from them and they are no more expensive than the dealer.
http://www.tld-corvette.com/