Yonke Racing in Safety harbor will prolly do it for u and i can almost garuntee it will be the cheapest.

or u could let someone here do it. but then again its not like they are gunna back there work in the event something happens. also u will need an alignment afterwards

better off renting the spring tensioner and doing it yourself. once u pop the assembly off its jus
1: compress the spring
2: take top nut off top of shock
3: slowly realease tensioner
4: replace spring.
5: repeat in reverse