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1. Non fiction (rarely on sale)
2. By accident
3. When Amazon was cutting off downloading
4. Next in series if it wasn't on sale in a long time (ereaderiq.com).
For #2, I bought a full priced Simon Scarrow book using credits and they weren't applied. However, I didn't notice the price difference until after the return option had passed. I already know Amazon doesn't fix lost rewards credits.
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