When I do sites like this - I purchase and use a prepaid Visa or Mastercard. I never put my card out there like this, that I use regularly.
I have not used this site - but now look it over. I have a few ebooks for knitting but none for quilting. Somehow I have a hard time with ebooks on crafts - I like to thumb back and forth between pages and find for myself it is not as gratifying using the tablet - lol!!