Well, it seems to be reasonably stable at $0.00 now, so unless someone else gets surprise-charged, I think this is supposed to be the real price and not a glitch freebie. I think Sourcebooks likes to rotate their offerings on Thursday/Friday, usually?
In any case, I went and emailed Amazon CS almost immediately after I noticed (yay paranoia! now I'm going to feel compelled to check "View Your Order" everytime I get another freebie, aargh) and backed it up with a screenshot I'd just taken of the $0.00 price (and the "you bought this on February 4, 2011" banner across the top of it).
So hopefully they at least credit people who ask for the difference, even if it does turn out to be a glitch freebie. If not, one can always refund.
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