Here are the home pages of some chip manufacturers that make chips for the casinos:
1. Paulson Gaming -- the familiar "hat & cane" mold chips
http://www.paulsongaming.com/

2. Chipco -- a newer kind of ceramic chip with edge-to-edge printing
http://www.chipco.com/

3. Bud Jones Company -- a number of different injection mold chips
http://www.budjones.com/

4. Gamblers General Store, in Las Vegas, retails a number of different weights & prices in chips
http://www.gamblersgeneralstore.com/

5. Marion & Co. in Florida has a different "elephant crown" and other molds
http://www.marionco.com/

These are professional quality, and not cheap, especially if you want custom artwork in the center inlay, but they will make an nice set for you.