My first eBook reader was an eBookwise. The special format was IMP and I bought the books at Fictionwise.
I also read PDB (Peanut Press, then Palm Digital Media, then eReader) books and I have books in that format that date back to 2002-2003. I bought those at Fictionwise, SimonSays, eReader.com, Books On Board, at least one other I'm not remembering.
About the time I started buying eBooks, Amazon sold them in encrypted LIT and PDF. Then they decided to stop. I was anti-Amazon eBooks for a long time because of the way they screwed their customers.
I occasionally bought PRC (eventually MOBI) if a book I wanted wasn't available in PDB.
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