I tried working with them, but no love. That $9k probably includes $2k incentive for a trade-in from 2005 or newer which they no doubt will take that $2k back from you on. I believe another part of it was a financing incentive, and their interest rates were terrible.
I mentioned before I ended up at Banks in NH, and with the Costco program basically got a similar or better deal than Quirk's with none of that hassle going on. Quirk was only $8k off MSRP at the time, so no idea if Banks has kept up.. things have changed obviously.
I did have to call Banks for their price though, they were not listing prices other than MSRP on their website at the time. They don't mess around though, the call was absolutely worthwhile and while I doubt I'll be shopping again any time soon I would call them first.