Sarah's Yarns also has cashmere...I haven't bought from her, but people positively rave about her, and her yarns :D
The 100% cashmere pages say that they're a direct sales/wholesale only item, but I believe that she opens it up to anyone every once in a while -- someone on the knitty boards posted that they got some from her for $13.00/200 yards recently. Worth an e-mail, IMHO!
Jojoland carries cashmere too: http://www.jojoland.com/do/menu/Sele...x=1&subIndex=0
I know a lot of people recommend colourmart -- but I bought some "DK weight" cashmere from them and it was really, really, fine, more like sport or fingering weight. It also wasn't very soft
...perhaps I got a bum skein or something