I've had what I suspect is a manifestation of the same thing happen to me. Essentially, Amazon seemed willing to charge an anonymous buyer less than they wanted to charge me for the same product. When it's happened to me in the past, I went to a "clean" browser, found the product without being signed in (or having cookies), added it to my cart, and then signed in. The product already in the anonymous cart retained the cheaper price.
I get price discrimination, but it gives you a very bad feeling when it's being obviously applied against you.
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