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It's those pesky price-updating bobble-birds that Sony employs*. They may possibly be possessed by evil sabotaging spirits to ensure that Sony gets the freebies for only a few hours out of what the publisher intended to be a full day. Mind you, Baker's not really helping by doing these repeated multiple 1-day-only promos and if I had to manually switch prices every 24 hours for over a dozen books per month I might not pay too much attention† to it, either.
Also, koland has said in the past that Sony uses two different server/database/whatever systems for the shopping site and the processing/billing stuff, which are somewhat out of sync, hence the differing listing/cart prices.
* At least, I assume they employ them on the possibly overly optimistic reasoning that any actual human being who showed such profound incompetence in multi-store promo freebie handling would have long since have been fired and replaced by a glass toy which could do the job equally as poorly and without undeserved pay, to boot.
† Though I'd at least try to have it drop shortly after I woke up and not reset it until I headed for bed/woke up again around midnight, so people would get longer than a 4-hour afternoon window to grab the freebie.
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