you can order cards mold chips from China or in the USA from some ceramic chip makers cost is ~30-40cents from China and ~60-90cents in the USA (+/-)...benefits of ordering in the USA is that the blanks are standard and you can reorder add-ons that will look that same later on....the Chinese orders are honestly a one shot deal, you need to order everything or risk quality control inconsistencies with add-ons or even between chips. Also US producers will hold your design. Some members from PCF have seen their custom chips marketed and sold from some of the Chinese producers of Cards mold chips simply because the design is great but you lose some chip security potentially.
here is a similar thread from just a day or two ago regarding #'s....really all depends on the stakes you plan to play and the number of players involved plus desired chip stack size.
how many chips for cash