You can buy blank large key mold chips here....
http://www.pokerstore.com/poker-chips-100-usa-made-clay-c-69.html?osCsid=269bd5d5bec3b798ecf695f4e7b50428
If you can get someone to hot stamp them you can get a personal chip made with em. I did that with my last PC on the web mold...

You can get other chip blanks. I saw Spragg had some H mold blanks on his site. I have found others on ebay too.
I already have blanks ready for my next PC when im ready to get the art work made up. I will eventually have these hot stamped.....