See also https://diskprices.com/ for inspiration.
The disk prices site does the exact same thing but the product is digital storage hardware. They made $50k from referrals to Amazon in 2024.
The disk prices site frustrates me because it illustrates so directly to costs imposed on the US from the current tariffs. I was able to get a 14tb disk from there DEC 2024 for $90 and now the cheapest is $220.