For me, it all boils down to finding what I want to read and then picking the most efficient and economical source. I do an online web search for eBook sources and prices using one of several search engines, check the local online library listings, surf through my favorite used bookstore, drop by BAM, check with reading friends, not necessarily in that order. Depends on the publishing date of the book, its accessibility and its price. The eBook is usually a preference unless it's a book I want to keep for reference or display, which at my age are few now. I'm out of the collecting stage and there are far and away too many books on my 'to-read' list to consider going back and re-reading much of anything.