Install prices for the three reciever setup are around $400.00 additional. (at least that's what I've been quoted by Radioshack and Circuit City. No one else in my area (baltimore md) seems to be able to quote an install price without me purchasing the unit from them. )
I found the above kit online, at
www.needadish.com. It was actually just a Philips dish and 5250 reciever for $50.00, and then 200.00 additional for the two extra recievers (although, if I can mix and match the recievers I can pick up some hughes or rca recievers for less than $100)