If you are talking about compression molded clay chips, the only places to go are BCC or ASM(poker chips online). BCC are notorious for terrible customer service and quality control, at least for non casino orders. BCC also won't make custom orders of smaller than 5000 chips but the color options and edge spot combos are some of the best out there IMHO.
ASM will offer more molds to non casino orders than BCC will and they are renown for excellent customer service. A minimum order for them is only 300 chips and they will do re-orders at a minimum of 100 chips. ASM chips are also top notch in quality. If your order has issues after being received, they will fix it with a minimum of fuss.
Before you go ordering from either, check to make sure that each company won't take issue with you reselling chips on molds that they own.
If you are talking about selling China Clay or plastic chips then you can just Google for some manufacturer info.
GL
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I forgot to add; for ceramic chips you can go to Sun Fly or Joe at Palm Gaming International. PGI has recently acquired all assets from Chipco which were regarded by most as having the best ceramic chips in the industry.