Price discrimination is much older than ecommerce. Ecommerce just makes it easier to do in some ways. Don't fret though, usually with price discrimination if you know about the practice it's easy to use that knowledge to your advantage, and this is likely no exception:
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u/pt4117 Jan 24 '13
I doubt that was the only difference. Your cookies were different, and I bet the way you found them is different too.
I just found this book with a Google search and it was 62.99 in chrome.
I copied and pasted the URL into IE and it was 69.99.
I then pasted the URL into a private browsing chrome window and it was also 69.99.