In Minnesota, at least, they were given out one token at a time over a period of two month period, to qualified slot club members. They were also avaialble for sale in the gift shop (at a premium).

For additional information on the ones that I know to have been produced from Minnesota as well as other locations, visit the link below.

There were also some silver issues of these tokens that were given to casino big wigs. Still working on getting those scans posted.

Hope this helps.

John