Woocomerce plugin

Here are a couple of plugin recommendations:

1. WooCommerce Product CSV Import Suite: This plugin allows you to import and manage products in bulk. You can list each banknote with its unique serial number as a separate product in a CSV file and import it into your WooCommerce store.
2. WooCommerce Custom Product Add-Ons: If you prefer to list banknotes as variations of a single product, this plugin can help. It allows you to add custom fields, dropdowns, and selection options to your product pages. You can list all available serial numbers in a dropdown menu for the buyer to choose from.
3. WP All Import: This is another powerful import tool that can help manage large inventories. It integrates well with WooCommerce and allows for complex imports, which could be useful if your banknotes have multiple attributes.

Once set up, you can manage your inventory to ensure only available versions of the banknotes are displayed to customers. Remember to keep your inventory updated to reflect the availability of each unique item.

I’d set up each bank note as a variable product, and set up the serial numbers as a custom attribute, then generate the variations from that. You’ll need to set each variation to a stock level of 1 and not allow backorders to make sure that you don’t sell one of them more than once.