We have plenty of chips from HBG, so we use the same chips you would normally use under your units: grey = 1, green = 3, red = 5, etc. (we also have blue = 10). On big rounds, like Germany v Russia showdown or Japan v American navy you just toss the appropriate number of chips into a pile on the table somewhere as you rack up hits. At the end of the round just count them up.
We have orange and purple chips specifically for facility damage, makes the board look awesome and colorful.
They were having a sale on these, $2.50 for 50 and they’re the exact same shape and size as the Global 2nd Edition chips.