For 150, it is more than likely coilover sleeves. What off brand of coilovers are they?
It takes me about 2 hours to install coilovers by myself [ including breaks and what not ], so figure about 60 bucks an hour for labor. Do you think that is too much?
If you feel you are incompetent to install these yourself, that is pretty much the going rate for spring install. Might as well throw shocks in the mix while you are at it.