A few of my favorite sites....
Heart of Stone Studio: This is a wonderful site for cabochons; the selection is enormous and is continuously updated. Also, Judith makes gorgeous jewelry out of her own beautiful dichroic glass. www.heartofstonestudio.com
Designer Cabochons: This site belongs to a very, very talented British couple who specialize in hard-to-find American cabochons in the latest designer cuts. Definitely worth the time! www.designercabochons.co.uk
Bead Bugle Online: I write a monthly column, Professional PMC, for this online trade magazine, which specializes in handcrafted jewelry. If you are interested, the column is published during the first week of every month.