After registering at the
https://www.goodreads.com/ website, I created a list for "Books I want to read". I was pleasantly surprised to receive an email the other day telling me that one of those books was on sale at the bargain price of $0.99 at Amazon. So I went and bought it right away.
I think I will put every book that I want to read on that list now, hopefully to receive more bargain price emails in the future. I never realized that this bargain notification was a feature at Goodreads, but I'm glad that it is!