When we see price discrepancies in the hundreds we feel like it has to be too good to be true--the truth is, it's an online store's prerogative whether to price match or not. If the Marc by Marc Jacobs knee boot is selling well on Zappos, then there's no reason for them to drop the price to a mere $495, like their competitor did. Basically, if something moves you keep it at full price and if it doesn't, you mark it down. Fashion is one of those rare examples where the need to be like everyone else just doesn't apply. May we kindly suggest that you take advantage of these differences? It's not sneaky, it's just business.