I collect the chips. These came in a set of 6. I contacted them about a year ago and they sold me a set. I don't remember the price but I don't think it was very expensive.
http://www.sierranevada.com/contact.html

There is also the Corona beer chip:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3254341032&category=899