I don't know how my house of bibliophiles made it to 2017 without knowing about Thriftbooks.com. Well, Chris may have known about it, but I sure didn't! A homeschooling friend of mine told me about it a couple of weeks ago, and this morning I checked it out.
Although many of the children's books are listed for more than I would pay at McKay Books, my favorite used book store, I found an activity book for our upcoming homeschool year for $4 that was about $13 on Amazon. I also found a research book Chris had been looking for priced at 1/5 of the Amazon list price. (Let me stop right here to say that I still like and use Amazon all the time!)
Here's a link for you to check it out. It includes a 15% discount for you, if you've never ordered from them before, that is good through June 5.
If you find something great, I would love to hear about it!