Searching for a plugin – Gold/silver repurchasing

Hey guys,
Would anyone happen to know about a plugin that could be used for gold repurchase?

Needed features:
1) Admin posts prices to the front end – I have this finished

— Never shown in frontend:
2) Admin posts purchases and sales in backend
3) Simple inventory overview
4) When a purchased item is sold, it goes into an “archive”
5) Purchase / Sale differences (income) is shown and filterable

I don’t mind if I have to purchase the plugin, provided something like this exists. I know it could pretty much be done with WooCommerce, but no “products” would be shown in the frontend, I just don’t know how to deal with the income/spending part to show this in monetary values.

Any help is appreciated!