KarstSports
   
   A great online catalog for caving 
   and climbing gear


REI
   
   Huge selection of all kinds 
   of outdoor sport equipment


Campmore
   
   Good selection and great prices, 
   mostly backpacking equipment


NSS
   
   A national organization dedicated to caves. 
   This is a great resource for info on caves and 
   an organization you should be a member of if 
   you have any interest in caves.