Pick out a box full of books for 3 credits. List your books in order of preference and order the top 3 from my shelf. I will fit as many as I can in the box and mail to you. I'll let you know how many fit and which ones before mailing so you can decide if you want the deal. At least 7 or 8 books will fit unless you pick all the biggest  books. If you pick smaller books 10 or more should fit in the box. Pick a few extra in case I can't find one or two of your choices or in case more will fit in the box. I have several boxes available so will try to fit your choices into one of the boxes.