Bought one of those '20 oil changes for $X' cards. The first time I tried to use it I dropped off my car in the morning. Got a call from them in the afternoon telling me how I needed tons of additional work, new tires, etc. Said they got me a 'sweet' price of just over $700. Right.
Also really pushed their variety of flushes. I'll let you make your own conclusions on that. I'll use the rest of my 'free' oil changes but that's it.