www.sounddomain.com will price match. I'd look for a place first that is authorized by the manufacturer so you get the warranty. Manufacturers don't warranty the stuff from ebay but that's where you will find the cheapest price. I used sound domain for my rockford amps, got them to price match and got the rockford warranty since they are authorized.
Definitely look for an authorized online dealer. I got burned on an Alpine unit when I bought it online. It wasn't until I had a problem that I found out that Crutchfield is the only authorized online Alpine dealer.