here but I made my own in MS Powerpoint since I wanted to save paper and get more cards out per page.
The holder on the left gets glued inside the book and the card fits inside. When you lend out a book, you write the date and the person's name on the card and keep it.
Here's the box (seen from the top) I made to put it in. It was also the "packaging" :D
Let's go play somewhere:
http://ppp-makeitmonday.blogspot.com/ (#120. the current post didn't have a seperate link)