Sales or service? If sales...none in Md. they will all try and gouge you for 10k on a new one. Service...there are a few that will take care of you. Criswell/Damascus Chev/Sport (great mechanic...managers suck).
It's your business, but FWIW, arrange your financing thru a bank or credit union ... not a dealer ... then go out and find your perfect car from a private seller ... or on a dealers lot if you have time to check out the car thoroughly.
Too bad you're not ready to pull the trigger now, because sweet cars like this one are out there ... http://www.z06vette.com/forums/showthread.php?t=103505&page=2
Good luck in moving the bike ... sounds like a very specialized example that has to find the right buyer ... might take some time.