Two books:
The John Lennon Letters, edited by Hunter Davies—thanks to Moogmodule flagging it in a different thread—and
The Last Days of John Lennon, authored by James Patterson, which I bought with a bit of skepticism given that Patterson writes fiction novels. Both are on the way from Amazon.
One thing I wanted to get but could not find was a Beatles phone cover for an Android phone. All the ones I found online were for iPhones.
(My kids keep encouraging me to make the leap from Android/Samsung to iPhone, but I'm too much of a technophobe. And I no longer have a teenager at home to explain everything to me.)