Well, I'm not revealing all my secrets (!), but would like to share my personal favourite bead shops.
My most favourite, and the one that I have used most and return to again and again is Bluestreak Beads. Their service is quick (I ordered supplies on Friday afternoon and received them Saturday morning) and the quality of their beads is fantastic. When I first taught myself to make jewellery, I started by using their guide, firstly with elastic bracelets. Here are some of the things I have bought and loved from Bluestreak (images below):