http://www.campmor.com has lots of great camping gear - sleeping bags, pads, cookware, ... Usually their pricing is good, but every once in a while it is a bit high.
I get almost all my outdoor clothing from
http://www.cabelas.com http://www.forestry-suppliers.com has an unusual selection of stuff, including a great selection of compasses, axes, and saws.
http://www.brightguy.com for headlamps & flashlights
http://www.aeromedix.com for knives (Rittergrips)
http://www.alpsmountaineering.com for my tents - GREAT discount for those involved in Scouting (girl or boy)