I generally buy e-books on Amazon*, then use Calibre to convert to EPUB and sideload to my Kobo reader.
That all works fine, but... I noted the other day that many of the Amazon books I bought have since been updated by the publisher.
What's your technique for handling updates? Or do you just ignore them?
*I buy from Amazon
- from habit (have bought there for years),
- convenience (I'm already on Amazon),
- double-check (it tells me when I already bought a book, which backs up my check in Calibre),
- price (I tend to assume more sales, better prices)
But I'd consider another source if there's a good argument.