Humble Bundle has a bundle of books (https://www.humblebundle.com/books/diy-electronics-wiley-books?linkID=&mcID=102:5e2b666d2901891ba0290e59:ot:5a0e5ff71c7d4cd39aeb5822:1&utm_source=Humble+Bundle+Newsletter&utm_medium=email&utm_campaign=2020_01_27_diyelectronicswiley_bookbundle&linkID=&utm_content=cta_button) having to do with hardware and software (in PDF form) for some really good prices. The lowest tier is five books for a $1, three of which have to do with the Raspberry Pi (the other two are BeagleBone and Arduino). Thought I'd let you guys know in case you're interested. Bundles are usually only available for two weeks but you can choose to be reminded right before the sale ends so you don't lose out if you're not sure at the moment. This one is available for 18 more days.
You can via PayPal or credit card, which includes the virtual kind like Virtual VISA (i.e. online debit card).
Thanks for posting the info, Jason. A very good deal.