New 20 ounce tumblers available now! Forum donation credit with purchase. https://www.wildguzzi.com/Products/products.htm#Tumbler
If you want stainless steel Keihan System in the U.K. builds OEM replicas for about $418 per pair (at today's exchange rate). Freight (about three days - you don't have any choice) is about $78 (or was to my door in Texas).