I am so resistant to the idea of e-books or ordering online, but see no alternative eventually.
Online ordering is cool!
When Amazon started letting other bookshops and book sellers list their second hand stock online, it opened up the possibility of filling every gap
in my collection that 40-odd years of browsing in real shops had failed to do. Which I did. In some cases I found books for 2 cents each
(plus airmail postage) that I'd been prepared to pay hundreds of dollars to own.
As for eBooks, I took both MMPBs and an eBook (on my iPhone) on my recent overseas trip. The eBook was an out-of-print, but quite recent book that I tried to order in from several local shops. It was great to be able to switch back and forth in formats while on planes and in boarding lounges, depending on lighting conditions, sleeping neighbouring passengers and fading battery charge.