First of all, eff that noise!
Second, Amazon
still does it! I see it between my work computer and my phone all the time (different IPs). Amazon also encrypts this stuff into their links if you do searches from one computer/account and send it to someone else. To bypass this, I search for stuff while logged out of my account, and when I find what I'm looking for, I only copy the beginning of the link that leads to the particular product, without the massive tail that tells them who searched for the item, when, and how much it was. They hate this one trick! (lol)
i.e.
amazon.com.../.../dp/B019RSVD3S/th=1 and that's where you cut it off.
After the dp/B0xxxxxxxx. Amazon will usually tack on the th=1.
(The B0xxxxxxxx is known as the ASIN # on Amazon, uniquely identifies all their products.)
By doing this, they can't track where the link came from, or what pricing was shown.