I would imagine by now you've found the info you need on these but if not, WWRP (world war robot portable) is the 6 inch line. The DIY lines were originally membership gifts to those who have a 3A membership. I have like 6 thanks to that. Hah. Now the only way you really find them is on eBay (a seller named Skamantha seems to have an endless supply of them). They are cool figures. 3A stuff is pretty rad, but as was mentioned they are designer toys so they are expensive, especially if you're looking at their 12 inch line.
Side note- make sure you use the right kind of dye for the clothing. The stitching is synthetic so if you don't use the right synthetic dye you'll end up with a black pants (or whatever color you dye it) with big white stitches