These are Piatnik Opti Supreme Poker Jumbo Index which are not plastic. Piatnik does make plastic cards which are harder to come by but they make some of the best paper decks on the market. I saw this deal for 8 New Sealed Decks(4 Red/4 Blue) on eBay. I think it is a good deal for someone if they want to pick these up.
https://www.ebay.com/itm/133537057681
https://www.ebay.com/itm/133537057681