The call them "coins" but I don't think they are leal tender, also that price is the "collector service, ie subscription....taken from the website
The Windsor Mint® collector service
By ordering an item inclusive of our collector service, you will receive further items in the same collection automatically (in approximately monthly intervals) for approval (approval sale). This means, you are free to return any items delivered within 27 days after receipt, without any reasons or questions asked. Any money paid for the item will be refunded automatically and without any hassle for you. This service guarantees that you will be able to complete a collection started as far as you wish, without fear to miss out on items in the collection. You can pause or cancel this collector service at any time by a simple information to us. Any details can also be found in our Terms and Conditions.
Your advantages joining our collector service:
• Massive savings – You don't only save massively on the starter item, you also secure regular discounts of at least 10% compared to the prices of individual items
• You will receive a FREE collection case or album as part of your edition
• You will receive a certificate of ownership with your edition
• You have the guarantee to be able to own a complete collection - without any missing items. Once you order a starter item with collector service, our experts make sure that all other items stay reserved for you and are released only when you cancel this service.
• You will beat collectors buying individual items only to rare issues, due to your completion guarantee.