Yeah, I can see that. I read an article recently about how companies will change the price of their products on Amazon based on what their competitors are doing, or something like that. It can be annoying, but I tend to not add something to my cart until I'm ready to buy it, otherwise it goes onto my wishlist. Then I'll use camelcamelcamel to alert me when it's at it's lowest historical price, so I feel like at least I've gotten it at as low a price as it's ever been. Rarely have I bought something at that alert price and then seen it go down from there.
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Matt