Anyone know how the Amazon "add to cart to see price" system works?

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Amazon keeps offering me Borderlands for $53.99 with that "add to cart to see price" thing and then like an hour later it'll be priced back up to $59.99. But the next day it'll be back at "add to cart" before going back up.

Does anyone know how this works or have any idea on how I might be accidentally manipulating this sort of thing?
 
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