As with most things, whatever someone is willing to pay. You can buy them at places like https://www.baldwin.co.uk/ancient-coins-for-sale/ancient-british/ https

As with most things, whatever someone is willing to pay. You can buy them at places like https://www.baldwin.co.uk/ancient-coins-for-sale/ancient-british/ https://www.baldwin.co.uk/ancient-coins-for-sale/ancient-bri... (no connection to the site just what I found) So a few hundred to a few thousand pounds.