How would I go around making a stocking system

So I’m trying to make a realtime all servers price that fluctuates on the amount of buyers it gets for my game, basically like bitcoin mining simulators image
which automatically changes the cash that a bitcoin gets if someone in any server buys it. I thought I could use regular bools ect but I need a way to get all the information from the other servers to realtime change everything. Anyone know how to do this?

You need to put these values in a datastore to make it available for all servers.

How would I go around making it available for all servers?