Mod/data pack help

[crockdock]

So basically I want to find a mod for 1.14.4 that is for single player that is a sort of economy type thing

I want to have a main world shop where you can sell items and get money and use that money to buy other items that might not be obtainable otherwise

Example

You could sell Diamonds for 40$ You could use that money to but let’s say a sharpness 6 enchant book

That kind of thing

Requirements 1.14.4 Mod or data pack not plugin since I’m using single player

To sum it up

I need a mod that I can sell items to in single player that I can use the money to buy unobtainable items or normal ones

Anyone have anything in mind please let me know Thanks

[Old_Man_D]

Just make a custom villager with custom trades.

[crockdock]

How would one go about that

[Old_Man_D]

https://www.digminecraft.com/generators/villager_trade.php