Buying Online

I get plenty of mountaineering equipment catalogs in the mail.  Sometimes I’ll see something that makes me go online to the company’s website to check out the item or sale or whatever.  It happened to me today when I received a mailing from REI and it got me thinking: I have been using the same 6 or 7 online retailers when I’m shopping for gear for the last 10 years or so.  Could I be missing out?  What are your favorite online retailers for climbing gear and why?

Hugo