Ask HN: Are there any tools for tracking GPU prices over time?

I'm looking for tools to track GPU prices over time across all of the different clouds and neo-clouds. Time series charts or that kind of thing. Does this exist? It would be useful information to us, & I'd be interested to see how much the prices vary over time and if one cloud remains the cheapest, or if they switch.

If not, would other people find this useful also? Thinking of building & sharing with others.