Those are Bud Jones roulette chips, the 24-groove style.
Here are some more from Harrah's in New Orleans, with the "BJ" mint mark:
I really like these chips -- they feel & sound & play & stack great!
As far as finding a manufacturer, the best place to look is the Chip Guide online:
http://www.chipguide.com/
Follow the link for Nevada chips or just go here:
http://www.silver-state-treasures.com/nevada.htm
[Edit: same link as jojo...]
The Summerlin resort doesn't have all their chips (like the roulettes) listed because it closed so quickly.