"Allen Klein: The Man Who Bailed Out the Beatles, Made the Stones, and Transformed Rock & Roll" $1.99
"Sh-Boom!: The Explosion of Rock 'n' Roll, 1953–1968" $1,99 by Clay Cole Had the pleasure of interviewing him and it was a lot of fun talking with him about rock's past. If you live on the East Coast especially in the '50s and '60s, you should be familiar with him.
Price is back up to $10.99 now, but it's worth mentioning that it's always a good idea to at least skim the reviews before purchasing an e-book. In this case there were some negative comments about the formatting of the Kindle version of the book. Not all e-books are implemented well compared to the paper editions, and I generally tend to pass on them if multiple reviewers complain about the formatting (although this is admittedly less of an issue if you're only paying a couple of bucks as opposed to full price).
I do look at reviews and often gets the free samples. In this case. I didn't find anything wrong with the formatting and I go across multiple devices (phone, tablet). As for the price, you're right. E-book prices are very volatile and for me if I think might like the book, I'll get it at the lower price because it may not be that way for long.
Not specifically a music book, but Led Zeppelin-related. "Diary of a Drug Fiend" by Aleister Crowley. Free.
"And They All Sang: Adventures of an Eclectic Disc Jockey" by Studs Terkel. Diverse collection of interviews with Janis Joplin, Louis Armstrong, Leonard Bernstein, Big Bill Broonzy, Bob Dylan, Dizzy Gillespie, Mahalia Jackson, Rosa Raisa, Pete Seeger, and many others. $1.99
David Ritz "Respect: The Life of Aretha Franklin" $3.99 (A note: I posted a link for the Mark Bego book recently. Frankly, that was awful. Hopefully, this one is better.)
Today’s Daily Kindle Deal Scar Tissue by Anthony Kiedis $2.99 https://www.amazon.com/Scar-Tissue-...?s=digital-text&ie=UTF8&qid=1542755159&sr=1-2
Acorn by Yoko Ono $1.99 https://www.amazon.com/Acorn-Yoko-O...coding=UTF8&psc=1&refRID=6TWH8KMAWV516WB9CTGF
Never Look at the Empty Seats: A Memoir by Charlie Daniels $1,99 https://www.amazon.com/Never-Look-E...coding=UTF8&psc=1&refRID=W69G5MX8FF2F12SX3RTJ
The Most Beautiful: My Life with Prince by Mayte Garcia $2.99 https://www.amazon.com/Most-Beautif...=digital-text&ie=UTF8&qid=1543238678&sr=1-381
Not music related, but classic sci fi. If anyone wants to (re)read Heinlein's "Stranger in a Strange Land", it's selling for $1.99. https://www.amazon.com/gp/product/B000TO0TDK/ref=oh_aui_d_detailpage_o00_?ie=UTF8&psc=1