In Laramie, WY, there is a gear shop, Big Hoss Mountain Sports (http://www.bighosswyo.com/)
We happened upon it on our first day in WY and spoke with Leo who was really helpful in terms of knowing a lot about the area–recommending camping sites, routes to climb, places to rest and a lot more.
Camping is free in most of the park and Laramie is a nice college town.
Note: WY is windy. Be warned.