fictionwise
I tend to buy through fictionwise, I love their multiformat.
When I can't get it in .imp format I tend to buy in .lit format and use convertlit to convert it over to format that is readable by my librarian program.
Gutenbergs .txt and rtf files work well.
I can convert mobi books, but frankly it makes my head hurt to do it, so I avoid it as much as possible. .pdfs tend to turn out very weird when converted.
My main bookstores are: fictionwise and booksonboard
Amy
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