Although ziffit is the best and pays more than others I still find it very frustrating because after the first 4 books that they always accept I can go through my list of over 300 books and be told not buying yet, so it usually takes me a week to sell 10 books, which is still under £5. Then when they get the books they say so many are not there, (which they are) so then I have to start emailing them to sort it out. To be fair they do sort it quickly. I still have hundreds of books to sell so I will keep using this site because like I said they are the best. (sorry for the rant). If you have books to get rid of then use ziffit. When all's said and done 3or4 pounds is better than none.