These Anchorage area shops stock Mountain Bike Anchorage:

Alaska Mountaineering & Hiking (AMH)
Alaska Public Lands Information Center
Anchorage Museum of History and Art
Barnes & Noble
The Bicycle Shop
Borders Books Music & Cafe
Campbell Creek Science Center
Downtown Bicycle Rental
Fireside Books (Palmer)
Girdwood Ski & Cyclery
Lifetime Adventures (Eklutna Lake)
Metro Music & Book
Paramount Cycles
REI
Speedway Cycles
The Sport Shop  
Sunshine Sports    
Title Wave
UAA Campus Bookstore