I just use regular collectable card holder sleeves and store them in folders. I do it for a lot of stuff, not just MPs (e.g. JP BW, CR, G1 reissues, ML, SL, GF, BT, other TF collectable cards etc.). Just out of interest lancalot, how easy is it for you to view the reverse side of your MP tech specs cards? Because as nice as the artwork is, the real "meat" of the tech specs is the text on the back which is important to me. But then I guess it might be less relevant if you don't read Japanese (), although I also like looking at the toy photography on the reverse side too.