How about some international Muji awesomeness you can get shipped to the US? The exchange rate may kill you, but the Muji UK online store ships to the US and Canada, no sweat.
Fortunately, this washable cloth coloring book will last long enough to make it worth the hassle.
Washable Colouring Book, £9.95 + s/h [muji.co.uk]
You probably already know, but there's a few Muji stores in the U.S. I didn't see this coloring book in their online offerings, though. I fell in love w/Muji on a trip to Paris, and can't wait for more stores on this side of the Atlantic.