This is a fairly easy job to do yourself with a spring compressor that you can pick up at auto zone. You will need some big sockets and a breaker bar (unless you have a compressor and impacts in your garage...best $500 we ever spent!)
I have Tokicos on the way from Stillen. Got em for $340 (all 4).
So, if you're getting someone to put em in and alignment, $500 isnt really a bad price, cause Im going to have to get mine aligned too, which will be 50 or 60 bucks. Plus you'll have a good bit of labor. If you change em, go ahead and do all of em at one time.