I am not sure of the rate for having someone install them, I'll be doing them very soon myself and figure parts for front and rear were around the price as you were quoted for just the fronts installed.
Here is the link:
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ih=005&sspagename=STRK%3AMEWA%3AIT&viewitem=&item=150008917177&rd=1,1
Maybe you could see how much is labor only and you buy the parts.