I was looking for some foam padding for the Flux battery boxes, and of course the 'foam blocks' from HPI are quite expensive for just some foam. So I went to the 'hobby and arts store' (Michaels, although Hobby Lobby probably has them, for those of you in the States) and looked around and found some of the same stuff that I used on my RC8T battery tray except without a sticker on one side. No foam blocks, but three rectangles make up one HPI foam block; even better they can be used to better shift the weight of the batteries around.
Here's a pic of the stuff I got...
Oh and just some gratuitous shots of my latest Flux body.