I would suggest to google your area for a local coin store. I did, and found a coin store about 15 minutes away. I took a couple with me to test them out (just in case). Once I found out they were only a dollar, I bought every one he had. Online was looking like a dollar too, but when I added shipping it came to almost 2 bucks each. Spinettis has them 10 for 10 bucks, not sure of the price for shipping though.

http://www.spinettisgaming.com/10-Air-Tite-Chip-Holders/

Hope this helps!