Wholesalers and LFS can probably get them for you. Try to see if a LFS can keep an eye out for one.
I was lucky and got mine from user Gig'em. He had a few and there was one that had a perfect color and the size of the foot was only 3" (opens up to 8"). Probably the smallest you'll see. He doesn't actively sell them currently, but has at least one more in his frag tank that he was eventually going to sell. You can ask him, but I think it's on the more medium size.
iBlueWater has them sometimes. You can also email them and they would be able to get it for you. Just know the price is kind of higher through them, but probably worth it.