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Free might not be the right wording to use. However, these are brand new books not used. You are only paying 3.99 not full price for a book which can be between 8 and 30 dollars. Plus there are several MAB books  are wishlisted so you can post it and get your credit back. I received a MAB book and will be reading it soon and then posting it to get my credit back.  So it is a pretty good  deal compared to going to a bookstore.

In relation to the Market books that cost: $ + credit + shipping these are" free + credit + shipping. Its all relative. Kind of like swapping here for free. You have to pay for shipping so its not really "free", but you don't pay for the site.

i agree with the OP...it's cheaper... but not free.  the wording is so misleading!!

I found that after the first "free for a credit" "plus postage, of course"  book, all the others ship for a dollar.  So I ordered a big bunch of books all together.  Many are wishlisted, so when I'm through I can post them.  I try to keep posting to clear off space on my bookcase, which seems to shrink all the time.

Yep, I think it's poorly worded.  It may be inexpensive, but if you have to throw in a credit PLUS shipping, it's not free.