Try Litko's BaseMaker™ tool. Choose to have your base made from any of 20 different materials. You can even get special features like rounded corners on your bases.
I just want to say as a French customer that I've had no problem making my invoice and I received it in the promised delivery time. Good price, swift delivery, good packaging.
Really good :)
Magnetic base, 12/21/2007
Reviewer: Jean-Michel GOT (NIORT, FRANCE)
Ok for the smallest D&D minatures (Pseudodragon for example).
You will find that you need the 20 mm for bigger but small critters like goblin or kobold.