Some of my favorite places to visit are:

www.groomers.org

www.petgroomer.com

Distributors & Wholesalers that I recommend:

Groomers Depot

http://groomersdepot.com 

Professional Groomers Supply

http://home.earthlink.net/~pgsupply/

Pet Edge

www.petedge.com

King Wholesale

http://www.kingwholesale.com/

Great products & equipment:

MDC Romani - Clipper Vac

www.clippervac.com