You might have to wait until next season, I can find many stores that sold out of the 2-3 designs that were available.
The maker is Camelot -- that might help your searches.
Fields Fabrics (a small Michigan chain that I have used online) has a duck cloth panel, so maybe not ideal for your project but could go on a back? They also have bags of small pieces of fleece....
https://shop.fieldsfabrics.com/NBAR-...48_p_3249.html
Likewise, not good for quilting but there are some flags and such on Amazon.