I use the Secret Weapons Miniatures stuff, but I buy it from
www.miniaturemarket.com because they are cheaper for the product and the shipping.
www.secretweaponsminiatures.com Here you can see all of the bases they make.
War Store has a ton of them from a ton of manufacturers as well, Shipping is higher so buy in bulk to make it worth while.
www.thewarstore.com
BIGGEST thing with resin bases is, wash them in warm soapy water before trying to prime or paint them. I have found that for some reason they have a ton of mold release still on them. Also Plan out where you are going to put your models on which bases before painting them. It sucks to have a painted model and a painted base and then your sitting there trying to fit a round peg into a square hole.....