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Make sure you find a reputable place. I put Goodyear F1's on my car, and 5 months later the rears were bald. Had it aligned, brought it home, and noticed that the bolts on the rear suspension looked untouched. I called the shop about this, and they gave me a song and dance. I chose to believe them. Installed new Goodyears, 5 months later, they are now bald. That's 3 sets of rear tires in less than one year. Just installed a cheap set of Kumhos, and will try another place on Monday. Beware - a bad shop can cost you a lot of money in tires!
Tire Kingdom does its for $79.99 for one year. I have used it about 5-6 times in that year. Changing between autocrosses as I like or don't like certian things. They have been pretty good about it. Most places will not let you do anything other the stock settings, but I just hand them the camber/caster/toe settings and they have done a great job for me. Also give me a print out of the exact specs they got the car to, so I can figure out what changes I might need next time.
Its suprising because I hated them before, they once mounted my chrome wheels with wheel weights on the outside, and flipped the right and left side wheels!
Go for a deal where you can get realigned for any reason as many times as you want within X years. It will pay for itself even if you use it just once.
Oh and make sure you get a 4-wheel alignment, some shops won't/can't do that.