Many of Crutchfield's prices are high, even terrible. But no worse than Best Buy etc. When they put stuff on sale their prices are pretty good. Most of the very good prices on new car stereo on ebay are from equipment liquidators. The prices are very good but they offer no warranty other than for DOA equipment. I've bought several times from these sellers without problems.
Crutchfield excels on support. They provide dash kits, wiring harnesses, usually for free with a head unit purchase. And you can call them with any questions you have during installation.