I don't buy ebooks at all. I have something over 1000 files on my device now, mostly epub, pdf, and djvu. The only non-free ones (aside from a handful of technically illegal ones I don't lose sleep over) are the pdfs of Martin Gardner's books my wife got me for Christmas a couple of years before I got the e-reader.
I got this thing to read Project Gutenberg books and free mathematical papers and lecture notes. Then I discovered the library here at MR. I don't see me ever buying any ebooks.
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