They were probably locally supplied eibach springs and that sounds about right for what places charge including labour. The first time I had eibach put in it was 680 all up. I didn't know back then, i'd never do it again. Even if you want springs only and someone to install them, get them off ebay and then get someone local to install them. Save a couple hundred. But as others said, I suggest either springs + sport shocks or coilovers, not just springs on stock shocks. Id recommend getting it from ebay because of the dollar, and then getting it locally installed.

As for places to install or supply , what area are you in? I can recommend some.