My favorite yarns are from Hobby Lobby. At the top of my list is "I Love This Cotton", both for the hand feel and variety of colors. It is a smaller gauge than the "I Love This Yarn", so you may need to use a hook a size larger.
Another favorite haunt of mine is http://www.herrschners.com/emails/es_030811.asp?sourcecode=9118165&link=1&email=1327393
The above link is their Fat Tuesday Sale. What makes Herrschners a great online resource for yarn shoppers is their search methods, where you may search by weight. Here's my search for #2 weighted yarn:
Also, their menu offers simple navigation because it has a "Yarn" option. Herrschners sells some yarns in bulk, has a nice catalog, and offers the online shopper and opportunity to try new fibers. Thank you Herrschners! If only they would take the second R out of their name. :)
In Texas, summertime is my "winter" (indoors) season, because I'm a frail flower who melts in the heat. Springtime is my project planning time. Happy shopping!