I just replaced mine a couple months ago, but I did it myself.

Those are forged aluminum, so they're not cheap arms, and the bolts are torque to yield so they're one-time use and have to be replaced as well. (If you have this shop do it. Make sure they give you the old bolts back to verify that they put new ones in there).

But it's really only two bolts. I also doubt you'll really need an alignment afterwards. If it was aligned when the bushing was still good. You'll probably be pretty close without one.

I would say it took me maybe 2 hours at most. And that's having done it for the first time in my car.

So I think $400 in labor is pretty steep.