http://www.yarn.com/webs-knitting-crochet-yarns/ - best prices I've found so far. I can't wait until I have money. I need to restrain myself so that I don't end up with boxes and boxes of yarn. I guess it's a good thing that all I've got right now is cheap acrylic stuff; at least I won't waste good yarn (and money) on learning mistakes.
Dale of Norway Baby Ull - light weight wool, lots of colors, $6.90/180 yds
Blue Sky Alpacas Multi Cotton - organic cotton, bright color combos, $9.70/100 yds
Brown Sheep Cotton Fleece - cotton/wool blend, decent color selection, $9.20/215 yds
Valley Yarns Deerfield - alpaca/silk blend, decent color selection, $5.99/109 yds
Misti Alpaca Suri & Silk - alpaca/silk blend, decent color selection, $4.79/109 yds