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A: You will likely experience a temporal paradox, causing a rift in the fabric of space-time. This may result in the following symptoms:
A: Ha! You think you're so clever, don't you? Well, let us tell you, the answer is... NO. You will not get a refund. You'll have to deal with the consequences of buying a product from a time when it wasn't even available. That's just how the time-space market works, pal.
A: Oh, come on! That's not what time travel is for! That's not what the Time Traveler's Code of Conduct says, at least. But if you insist on being a temporal opportunist, just remember: the consequences of your actions will be dire.