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I made some admittedly half-hearted attempts. None successful. Apart from it being difficult, even if I were to get some stores interested, I'd be lucky if they pay me print cost. And more likely, they'd pay less than print cost. The only way to make that profitable - as far as I can see - is print thousands of books, and get the lower print rate.

Selling online at least leaves a decent profit margin. Of course, then you have to actually get the sales. :)

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