Here's some numbers for you:
Rocky Mountain Adventure: 800-858-6808
The Mountain Shop: 800-403-5720
I don't recommend one shop over another, I'm a customer of both and have gotten good service at each place. RMA is closer to the river though. The main difference, I've found is in the boats they carry.
My husband and I are part of a crew of husbands and wives, we boat class III-IV. PM me and I'll give you my cell number. As far as I know, we'll be around then. We are in Laramie, but we drive down to the Poudre about 3 nights a week this time of year. We are only available in the evenings, unless I'm working at our branch in Fort Collins, (like today.) There's a ton of cool boaters in the Fort too.
If you don't get any takers here, you also might want to check out coloradokayakers.com.