I'll definitely recommend these folks; I've bought figures, gashapon, books and recently dolls from them.
HobbyLink Japan
http://www.hlj.com/top/DolLocation: Japan
Sells: Dolls, doll parts, clothing, accessories, doll books/magazines... plus figures, gashapon, models, hobby supplies and more. Lots of Azone and Obitsu, plus Blythe, Momoko, etc.
Shipping: FedEx, EMS, SAL. SAL is reasonably cheap for small packets under 2kg. Shipping Warehouse feature gives you control over when/how things ship; good for separating preorders and out-of-stock items from in-stock items. Group orders might be big enough to require FedEx/EMS.