That just means it's expired now at those stores. Sony and B&N both have a habit of continuing to show a free price, but changing to a pay-price on books that are no longer free for several hours after the promo has expired.
Thankfully, with the new B&N purchase-confirm even on freebie systems (and this is why one should always have the cart option set for Sony), it's harder to get "caught" and dinged for the purchase price of a supposed no-longer-freebie.
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