Representing two ends of the spectrum of size of things, these books are now cheap in Kindle format now:
The exact price of each of these books will vary. Some of these prices are likely to expire soon. The prices range from free to about three bucks. The exact price will depend of if you are prime member, but for most of them it should not matter.
The first one is a shock to me, I did not know, of I forgot, that Sean B. Carroll had written this book. It looks fascinating. Continue reading Many mostly science books really cheap