Leekeworld- A great places to buy wigs, shoes, eyes and accessories. They also have their own line of dolls.
LUTS- Another excellent place for wigs, shoes and the like. They also carry a fairly large collection of dolls in a range of sizes.
Dream of Doll- DoD carries their own dolls in various sizes. They also have clothing, wigs, eyes and shoes.
Volks- The first company to come up with bjd's. They have a large collection of dolls in various sizes and styles along with accessories. We now have a Volks store in the US, which you can visit here.
Undead Threads- A good source for patterns to make your own BJD clothes by.
Den of Angels- Their forum is one of the best places to go if you have a question about anything BJD-related or if you're just looking to network. Also, check out the FAQ.
Broken Symphony- A really good source for information on caring for and customizing your doll with lots of step-by-step photos.
Dollmore- Another all-around site with dolls, clothing, wigs, carrying bags and other accessories.
Doll in Mind- Line of dolls in a range of sizes along with clothes, wigs and other accessories
Souldoll- Another line of dolls with a variety of clothes, shoes and other accessories to choose from