Yeah, I don't think "clamshells" are what you're looking for. This may help some though, The Container Store - The Original Storage and Organization Store®
Pretty sure they've never made clamshells specifically for TF figures. I'm sure there are some that some TFs might fit into but not as secure as you'd like them to be.
Well, I was thinking of this site I found for most of my carded figures; just didnt know what else there was out there. I did look at the Container store but they are very expensive for the amount of figures I have http://www.blisters.com/stockclamshellist.html
some thing similar to afa cases? i don't think the blister/clamshell is big enough for most of the transformers boxes.