Bennie, they are not rare but still very collectable. I have the 5 chip set. There is also a $1 and $25. Bill Akeman got a fairly large quanity right after the filming was over.

Here is another 5 chip set of Tangiers chips. These were made by CSI and used when filming casino scenes on the show. This is the only set, I know of, that is out, but there were plenty made and will probably show up some day.