Poker chips are made in tubes of 25. So, when ordering a set containing 200, 300, 400 or 500 chips you are able to choose which colours you want, so long as it is a multiple of 25.
That is to say you may have 25, 50, 75, 100, etc., of any colour, but you may NOT pick quantities such as 12, 34, 55, etc.
The current denomination availability is given below: