Thanks for the link as the linked article is paywalled. The 500$ cartridges are the ET carts. All the other ones are about 50$ I think the ET carts are the m

Thanks for the link as the linked article is paywalled. The 500$ cartridges are the ET carts. All the other ones are about 50$ I think the ET carts are the most expensive since that's why they started to dig in the first place.