These are the only denominations used during the events at the Golden Nugget's Grand Poker Series which runs June 6th through July 6th, 2008. In addition to the set of 4 chips I've got the following extra chips for a total of 8:

25 NCV = 2
100 NCV = 1
500 NCV = 1
1000 NCV = 0

Not sure what I'll do with them, but I'm leaning towards just posting them on ebay. If you're interested please e-mail me with offers. Thanks and enjoy.