Trying to find real data that amazon prices are going up:

Is it this product?

https://camelcamelcamel.com/Dr-Elseys-Premium-Clumping-Litte...

It looks like the price has been roughly the same for 4 years with jumps up and down. And before that, declined a lot.

If we include inflation the price seems to be declining.

Here's a graph for a chair mat:

https://camelcamelcamel.com/AmazonBasics-Carpet-Chair-Mat-47...

If anything, the graphs seem to show a lack of price discovery as it's not jumping around enough. Maybe camelcamelcamel doesn't sample at a high enough frequency.