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Maybe include a "free" option. Some of us, me anyway, normally bought pbacks from charity-shops and "car boot sales" (garage sales in the US). These cost a few pence. I prefer ebooks to be free: public domain or creative commons. Otherwise, I'll put a parrot on my shoulder and a patch on my eye!
So a free option might be a good idea, though it could distort the poll if you want to know how much people who would pay, would pay (?).
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