I have seen a number of examples including some graded ones, and they have all had a degree of discolouration ranging from a subtle yellow through to a distinct brown. The plastic also becomes increasingly brittle as it discolours. I would imagine getting one with totally clear plastic would be difficult & expensive, like some of the POTF figures. If you go on the AFA website it may be possible to establish whether they have any examples with clear plastic documented. In theory for every one that has been graded there should be a few ungraded examples out there.