Etsy:
https://www.etsy.com/shop/frumpybunny
Redbubble:
http://www.redbubble.com/people/frumpybuncrafts/shop
society6:
https://society6.com/frumpybunny
40 free listings when you open your own etsy :
kitty coloring book:
Physical copy- https://www.createspace.com/6612483 or https://www.amazon.com/Kitty-Cat-Coloring-Book-Stress/dp/1539169995
Digital printable pdf- https://www.etsy.com/listing/482402041/printable-cat-adult-coloring-book-20
Zazzle:
http://www.zazzle.com/frumpybunny/collections
Threadless: