Do you find that you have sufficient 5s and 10s. In the past my group has used the paper ipcs but I like the idea of being able to see how much money your opponent has from across the room. Hence the poker chip idea.
I find my croup tends to sort there cash into piles based on what you are planning on buying. So if you were planning on buying 4 infantry a tank and a destroyer, most of my group would divide their cash into 3 piles and place their units they plan to buy on top. So the first pile would be 1 10 and 2 ones for the infantry. Second would be a 5 and a one for the tank. Last would be an eight and three ones got the destroyer. As such I find more smaller bills as opposed to lager ones are typically more useful. Generally speaking.
How many extra ones do you find you needed? I don’t think I’ll need a lot of 25s as only a few countries would realistically use given our groups purchasing fetishes. I don’t want to overspend but I also don’t want to have to constantly make change cuz we barely have enough small bills.