I'm pretty sure that the man has become more obsessed with hunting out second hand DVDs then me. It's like a game of who can get through the door quickest to find the DVD section and hunt out the perfect DVD for the boy. The man was so excited when he discovered Budgie the Little Helicopter on DVD, this is something we both watched as a child ourselves so he couldn't resist buying it for our boy to watch. We almost came away with the Power Rangers movie too but we hesitated and put it back. Though we did come away with a few cook books to add to our cook book collection.This made me think about second hand books and how this is usually how I get my hands on them. I actually cant remember the last time I bought a book from brand new, so many people donate them to book/charity shops once they've read them once that I'm usually quite lucky to get my hands on the latest release for like a tenth of the price. I guess going to the library can be classed as getting your hands on a second hand book, though the downside is having to return it. I'm one of those people that like to keep a book if I enjoy it to read again when I want. Same with books for the toddler, love seeing his bookshelf fill up with books he can read over the next few years.
How about looking for second hand books online or even swapping online your old books for new ones?
I've mentioned Oxfam online before but how about searching the Oxfam second hand online book store? Love the easy to use menu options which allows me to search via price, condition, author and subject. But what I love even more is that I know by buying a book from them, I'm giving straight to charity.AbeBooks is a online marketplace where you can buy new, secondhand, rare and
out-of-print books, as well as cheap textbooks. They connect you with booksellers all around the world and allow you to purchase the book through the secure checkout procedure and then the bookseller ships it straight out to you.
Another shop which you're most likely already familair with is Waterstones, well have you checked out Waterstone's Marketplace? Works in exactly the same way, 
I may of already tested it out myself with a purchase of some secondhand Dr Seuss books. Oops. They partner up with Alibris, another website which sells used and collectible books, music and movies.
A website which you can swap books instead of paying for them is Read It Swap It. List a old book and then sit back and wait for a email requesting a swap. It tells it you exactly how it works right here. They have a fab list of subjects at the side of the website which allows you to browse what you're after much easier. It's been a while since I've used it so may see if I could trade some of my old books and textbooks for some children's books.I know a few of you who read my blog have blogs
yourselves where you review products. How about receiving a book in exchange of a reiew? BookSneeze allows you to do exactly that. You simply sign up for a free account, choose a book from from the available books and then they send you a copy for free. You then post a review of 200 or more words on your blog and then you can do exactly the same all over again.