Three suggestions:

o Join the Casino Chip and Gaming Token Collectors Club
o Get a book on chip collecting
o Try eBay

The CC>CC is a great club. Find out all about them on their website:

http://www.ccgtcc.com/

Try getting a book on chip collecting. I recommend either The Chip Rack, if you are interested in just Nevada chips or The Official U.S. Chip Guide if you are interested in chips from other areas.

Here is a link to a list of books about casino chips collecting:

http://www.ccgtcc.com/library.htm

You can always find a ton of chips for sale on eBay:

http://listings.ebay.com/aw/listings/endtoday/all/category899/index.html

Good luck and welcome to the hobby.