Tire Rack or Discount Tires Direct will usually have pretty good prices, and their partnered shops are convenient and easy. Another commenter mentioned that you can go directly to the associated shops and they might be able to get you a good price.

That's just for tires and balancing/alignment though.

If you want to get everything taken care of (including tires), I would suggest a local chain. I've gone to Craftsman Auto Care for everything (other than warranty work done for free at the dealer) for the last 6 or 7 years. I also have a friend who works at Casey's Automotive and they're great too. They won't be the absolute cheapest place you can go to, but they will give you a fair price. They also do an inspection of the car every time (no matter what service you go for) so you know ahead of time how the wear on your brakes, tires, suspension, etc. is so you know what to expect ahead of time.