I have looked absolutely everywhere for this and can't seem to find it for sale anywhere. Pokevault has all of the other towels except for this one, I am guessing they only had one and it was sold before I checked :( I've looked on Y!Japan, eBay, Amazon, just about everywhere and I can't find it!
If anyone has one for sale, or knows of somewhere that has one, please let me know. Thank you so much! :)