I have also seen a $5K chip on :

A few scans from the film:

I don't know why more of these haven't hit the market. They may be like the "Rounders" chips that took a while show up. The DVD of "Ocean's Thirteen" contains a special feature in which the movie's producer takes a tour of the fictional Bank casino. According to him, the set was so detailed that it could have been an actual casino. The chips/roulettes are there - in volume. Maybe they are keeping them under a tight watch until "Ocean's Fourteen"??