Two sources to check out:

J.P.'s Corner -- see
http://www.jpscorner.com/casino-chip-collecting-supplies.html

They have multiple sizes & styles. Good prices, especially if you purchase 1 or more cases (250 per case).
They also sell smaller quantities starting at 50 airtites per unit. Plus storage boxes, etc.

C.T. Coins (Charlie Rogers -- long-time club member)
He doesn't have a website, but request his free supplies catalog by emailing him at:
ctcoins@aol.com

He also has all sizes & quantities, storage boxes and lots more in the catalog. Fast shipping. Solid customer service, etc.
He also sells at the major chip shows in Las Vegas & some other locations.

For price comparison, 100 airtites with ring are $70 in his catalog (=70 cents each). Plus sales tax, in California, plus shipping.