Juggling 3 books now.

So I'm 3/4th the way through Iron Man by Tony Iommi, 1/4 the way through The Stone Sky by N.K. Jemisin (the Stone Eater parts drag), and now thanks to listening to the Appendix N Book Club, I'm revisiting Gardner Fox's Kothar the Barbarian; I have one or two of the books packed in my packed up boxes of books, but before I went hunting, I found that (1) there are five in the series and (2) Amazon had the kindle version of the series on sale for $1.98 [$0.99 for an omnibus edition of the first three, $0.99 for the last two]. So now that's my on-phone book, for when I have my phone but not either of the other books.