We normally get a 50 lbs tank and fill our own when we play. We can go threw most of it as well in one day. I know our last game this year, we were down to our last 5 9oz tanks before we finished up for the day. This year we are thinking of getting 3 50 lbs tanks ($30 a tank) at one shot and using those for the first half of the season. And remember, nothing gets a nice full fill vs putting your empty tanks in the freezer over night.