I had the same problem on Sunday trying to get the last 3 and after "visiting" 25 shops and no block said the same thing!
I had the same problem. Only found 10. I struggled last month too so I'm wondering if it's worth all the time spent just to find these blocks. I love the patterns but there are so many cute patterns for free downloads, I'm not sure I'll bother anymore. I have found a few new shops to add to my list though.