Ebay is probably your best bet for good starting chips.

As for the amount needed, you could go by the following:-

Green = 25 x 8
Blue = 50 x 10
Black = 100 x 8

That will give you starting chips of 1500 per player, so basically you could get away with a 300 pc chipset IF they let you have 100 of 3 colour.

You're probably best off getting a 1000 pc set though, as you're covered if you want to expand your games.

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