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Does Calibre try OpenLibrary first, then Amazon? Would it be more straightforward to rank the cover download plugins so that higher quality sources are tried before lower quality ones? Or are you saying all potential sources are tried at once?
Unfortunately any ISBN won't map to the Overdrive ID, it has to be the specific ISBN of the Overdrive edition. That said, I think the scraping could still be done and mapped as you described, I'll check out the Amazon code.
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