Need a simple Warehouse Management Software

I am looking for a simple warehouse / item management software for a very small pokemon-Hobby/Business (Cards, Sealed Boxes). Something to keep track of stock, prices and orders.

I don't want to pay for an SaaS solution but have something i can run on my own homeserver. Any Ideas? I don't need to create invoices from there, just keep track of what Inventory i have and prices for it.

I'd love to hear your recommendations :D