Well in my case we already have the mounting equipment on the roof and wiring. And we were looking at new panels and a new grid-tie inverter, so 16 x 325W Kyocera panels was $5,600 and the SMA Sunnyboy 5Kw inverter was $1900 (total $7,500).

I would not expect a company to quote a new install for that price since they will have to add the mounting system and pay their installers for a day's labor getting everything set up.

[1] http://www.solar-electric.com/