^ ^^ I'd go for lowering it yourself also. I lowered my gen5 with TRD springs myself; just need some jack stands, rent some spring compressors (from autozone, $40 deposit, refunded upon return of equipment), a torque wrench (can rent also), probably a breaker bar, and some sockets. I've never really done anything major to the car before and was reluctant to mess with something important such as suspension, but I was able to walk through it just fine. At the time, I called up a bunch of shops around here in OC and LA and the cheapest labor for installing springs was from a small no-name shop for about $200 and the most expensive is from the toyota dealers (I was quoted around $600-900something).
If you still would rather have a shop do it, there's this place in Stanton:
http://www.autobacsusa.com/
They work with lots of modified cars, so they know what they're working with. The spring install there was about $210. When I was there, they carried Eibach and H&R springs. They'll only install if you purchase the springs from them though.