All you have to do is keep your receipt when you purchase a book and then once it’s been read, or within a six-month period, you can return the book and receive half of what you paid back, which you can either spend in store or take with you to spend as you wish.

Of course, the book has to be in relatively good condition, but even if it's a little worse for wear you can still return it, it will just be donated instead of sold.

The great thing about the program is, not only do you receive a discount on your book when you return it, but you can continue a cycle of reading each time you travel, meaning you never have to pay full price for a book again.

So, the next time you walk passed a bookshop at an United States airport, have a browse through the bookshop and know that you can buy a best-selling novel without paying full price.