Sounds fair enough... I went to a shop with the same question about 6 months ago and they told me that'd cost about $300 just to install the springs.
Very unreasonable price I think...
they did it for 250 and are giving me a free re-alignment after 1500 mile (which would me 100 more $) and making sure its still safe. I got my springs from Team-SR for the forenza which i have and the back dont fit perfectly