You can get a replica made, but there's no one who will make you clay replicas of existing chips, they'll be plastics. There is a company (Classic Poker Chips) who do make consumer clay chips, but they won't be able to exactly replicate the chips you want. For $1 and $5 chips you can try to harvest them from the casino, or purchase some from someone else who has harvested them. For $25 and up it's too cost prohibitive, because you'll be paying the face value of the chips. You can try to find similar other clay chips on the forum, and then go through the process of removing the labels and reapplying ones you have someone print for you. Since they're 'house mold' (the impression around the edge of the chips is the name of the casino) you won't be able to find substitute clay chips that match perfectly.