I've been mentioning a few Half Price Books finds from the last couple of weeks and I have just a few more, two of which I will mention right now. The first is a replacement copy of a Role Aids book from Mayfair Games I must have lost at some point along the way. I had it in the back of my mind to replace it someday and that day came last weekend when I found a copy of Dragons (1986) on the shelf.
Also, I picked up a first printing to replace my second printing of The Castles Guide (1990), a 2E AD&D supplement. As it happens, it is also a cleaner copy, so that's doubly good.
Finally, Merric Blackman has recently updated his listings of 5E adventures over on Merric's Musing here. If you play the system, check those out along with dozens of reviews he has done on many of them.