I prefer hobbyking. Really cheap parts an low cost shipping options available for my country. If you are within US you can find cheaper in ebay but if not check out hobbyking first.I must say that there are not many option for multicopter frames currently, but they have added 2 frames (4 options as a kit) within last month. So I am hoping they will add more frames in near future.
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There are a few here with plenty of other bits a pieces...http://www.goodluckbuy.com/index.php?target=products&mode=search&subcats=Y&type=extended&avail=Y&pshort=Y&pfull=Y&pname=Y&pkeywords=Y&cid=0&q=multicopter
Cheapest - Ebay