Rock on, smutsters!
Thank you to the authors. Is there a reason the UK versions are 99p while the US version is 99c (77p)?
Some authors elect to make the price 99p in the UK when they run their promotions (actually, more like 96p + VAT). While this is obviously a greater price than 0.99 USD, I suspect many do it to play on the "99 is more attractive than 1.00" pricing scenario.
In some cases it may also be an error on Amazon's end because I've had books myself that have been priced incorrectly in non-US stores and I've also had perma-free titles in the US take forever to translate to perma-free in the UK. In any case, we try to make sure that even though the books might be 99p for UK readers, they are still a good deal or discount.
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