We were shopping for a used truck to pull our boat and also serve as a daily driver, and initially looked at Chevy Trailblazers at a "Walmart"-style national chain. They made a trade offer for my Mazda3 and showed us a 2006 Trailblazer that we actually rally liked. Fortunately, they sold it before we could commit, and we contacted Hall. Initially on visiting the Web site, I logged onto a chat feature that I thought would connect me immediately with someone I could talk to. I found out later that chat function was run by a third party service and that leads were only passed to Hall after a certain period of time. But then my wife sent me a link to information on a 2007 Chevy Trailblazer that was on sale for about what the mega-dealer wanted for the 2006 -- similarly equipped and comparable miles.
We ran over to look at this vehicle that day, and my wife and I each test drove it. The folks there were very laid back and helpful. Turns out they were not only more than competitive on price with the Wal-Mart style dealer, but offered me a lot more in trade for my Mazda. AND because this was a GMC certified used vehicle, it comes with the bumper-to-bumper warranty.
We came pre-approved with financing, but Hall's finance department set us up with an even better deal through a local credit union.
I actually bought my Mazda from Hall's Mazda dealer, and they were very well-priced on that transaction as well. Moral of the story ... don't assume that big national chains have the best price on used cars. Your local Chevy dealer may have a better/newer certified vehicle at a better price. And it is always good to deal directly with a service department that knows the vehicle inside and out.