I do, and I LOVE it!! It is absolutely AMAZING... At least for a household of home schooling book lovers like us!
I signed up last Fall, and have been very pleased with the club.
It is absolutely free to sign up, and if you post 10 books (hardcovers too) you automatically receive 2 credits to use right away for FREE!
The books you list go into the system, and if someone requests one of your books, you mail it to them (it usually costs $2.15 approx) and earn another credit.
For each credit you have you can request a book of YOUR CHOICE ABSOLUTELY FREE!! In fact, if the books that you are looking for aren't in the system, you can even create a wish list and you will be notified when the book is posted!
It is SO cool! I have been very happy with all the books I have received. So far, they have all been in like new condition. For Christmas I got hubby a book off his wish list, a cookbook for myself, and the kids a few Catholic Mosaic titles. It has saved me so much money so far!
In fact, here is the book I received today:
Can you believe it? An out of print copy of the Christmas Mosaic book, The Trees Kneel at Christmas! Yeah!!! Not only that, it is in like new condition, and this book is listed for over $26 on Amazon for this condition. It really is worth it to create that account and place some books on that wish list!
Anyways, the following link is coded so that if you use it to sign up, I will get a bonus credit on my account. Although, I would be telling you about this club even if that wasn't the case... I am that pleased with it!