I had an Audi S4 shipped from Dallas, TX to Northeast Ohio for $700 with Texas Auto Shippers. The Lexus dealer whom I bought the traded-in S4 from arranged the transport and I was very pleased with the price and service. There is no way I could have flown to Dallas and driven the car home cheaper than $700 in airfair, hotels and gas.
Autotrader.com uses DAS. They provide a lot of options, that get pricey when added together, but you can also get a better rate by calling the office instead of the online quote if you are flexible to work with their existing transports.