One of my hobbies is actually a job. I teach both backpacking and camping at the University of Memphis. Here I am including many of my favorite and most useful
National Park Service - I was trained as a seasonal ranger for the NPS. I worked as a law enforcement officer at several national parks, including:
Kennesaw Mountain National Battlefield Park
Chattahoochie River National Recreation Area
Martin Luther King, Jr. National Historic Site
Ocmulgee National Monument
REI - Recreational Equipment, Inc. - A premiere company for outdoor equipment, REI has just about anything you could ever need in the outdoors. And at decent prices. If you are lucky enough to live near one of their retail stores, then be sure to pay them a visit. Highly recommended.
REI Outlet - If you are looking for closeout deals, this is it. Big savings on great equipment.
Campmor - Campmor is another terrific site for outdoor equipment. Be sure to request one of their catalogs. Their catalogs are exceptionally well done, fun to look through, and they offer competitive pricing.
EMS - Eastern Mountain Sports - Great gear - average prices. Again, if you are lucky enough to live near one of their retail stores, be sure to drop in and check them out.
GORPGear - From the people at GORP, Great Outdoor Recreation Pages, there is both advice and equipment and links to other shopping site.