A few weeks ago, I spotted a cool sort of die in Greenpoint, Brooklyn - it's a big wooden d6 that opens up like a box and inside are 6 smaller wooden d6es. The big d6 is around the size of a fist, maybe a bit larger, so I'm not sure if it qualifies as as die for the purposes of your collection.

I could have sworn I took a photo, but I can't find it now. If this sounds like something you'd like to add to your collection, I can see about finding it again.