I know Virgin Island Rental shop has great price, Cristy Sports is good.
Where else can I go to rent good demo skis with good price?
There are TONS.
Where exactly are you going in Summit Co.?
Do you have your own boots? It can usually save you $10-20 off a demo package.
Christy Sports has a HUGE demo fleet - doesn't matter where you go, there's one close to the mountain. There's one right off the highway in Silverthorne...
You could also try Breeze - they're close to the highway as well - in Idaho Springs I believe. Always heard good things.