Just wanted to share my joy of discovering Trade-In Book service offered by Amazon. I have only just  came across it and to my delight have managed to trade some of my existing books which I was planning to take to a charity shop for a number of books from OCA recommended reading list. It was easy to do and did not take much time at all. I now have most of the titles which I need to do my study. The books are wonderful - even  a quick glimpse through the pages gave me such inspiration!