our government [nuclear regulatory commission] believes this is a frivolous use of tritium and will not approve them for sale. I don't know if TAD gear ever got their tritium thumbstuds for knives approved by the NRC or not. Go figure -- the NRC allows tritium watches but not keychains

I got mine on ebay from singapore

http://cgi.ebay.com/ws/eBayISAPI.dll?Vie...IT&rd=1