If you are registered, you get access to the members only section, can participate in the buy & sell second hand forum and last but not least you can reserve your preferred username before someone else takes it.
I bought my equipment from HK Supplies (www.hksupplies.com) in 2000. They've been going strong since on e-Bay, mostly as a buy it now. Pricing is very competitive and service is great. I would buy from them again.