Two other interesting sources are:

http://www.bestglide.com/index.htm

http://www.campingsurvival.com/index.html

Campingsurival.com has a lot of stuff. A lot of junk, but some nice stuff too.

Oh, for batteries & chargers: http://www.thomas-distributing.com

Bandanas: http://www.wholesaleforeveryone.com
Trash bags: http://www.spectrumbagsonline.com