Your best bet is to check out this forum. There are a lot of information on different types of home used chips and custom chips. Just setup a profile and ask your question, a lot of great members will happy to help you. Make sure you specify your budget, how many chips and what are you using it for eg. tourney or cash game. One option you have is china clay chips, I believe the going rate for them is $.25/chip which is a better option to all the plastic chips that are out in the market.

http://www.chiptalk.net

Good Luck!