Amazon shows a 43% price difference in the same item shipped to the same address, but to a different account

Internet Archive founder Brewster Kahle (who also founded the company Alexa, now an Amazon division) ordered a pack of Sharpies from Amazon using the Internet Archive's business account, then, minutes later, ordered another pack using his personal account, both to be delivered to the Internet Archive: the order for the Internet Archive was priced at $8.63, while the personal order was priced at $12.37.

According to Kahle, the price difference is a feature, not a bug: businesses who pay extra for Business Prime ($179/year versus $99 for non-business Prime) get significant discounts on some items.

I have Business Prime and I see the price as $12.63 whether in a logged in tab, or in private browsing mode.

Below are the receipt for the Internet Archive, offer to me, and offer to my home business account (same price as the Internet Archive). Turns out I stumbled upon "Business Pricing." It's a "feature." Business Prime costs $179/year, as opposed to consumer Prime for $99/year.

Amazon.com Charging Me 43% More Than Another Customer [Brewster Kahle]