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Yeah, this has been happening for a while: http://www.slate.com/articles/business/moneybox/2010/12/how_...

I wonder if this is just a coincidence of timing between your visits. I went to the link in a normal browser tab, an d it was $699 the first time. Perhaps Amazon just happened to change the price between your visits.

If you need to buy plane tickets, it is also recommended.

The time of day is also an important factor in smart pricing.

Usually everything goes up when people is not asleep or at work.

Like if prices were different at the mall when it is full.

Same here. Interestingly the $799.99 non-incognito version stays the same price if you change the i5 to an i7. Possible bug?

the i5 and i7 heaving the same price makes sense because the i5 model comes with a ssd vs the i7 which comes with a hdd (hybrid).

This is why I always use camelcamelcamel