You are in luck! We have three different subscription sizes: 12 bars, 18 bars, and 24 bars, that can be changed around at will. (just like your flavor choices!) Simply log into My Account, click "Switch Subscription", then choose the quantity you want (don't forget to adjust flavor combo accordingly) and click "CHECKOUT"
You'll go through the billing process again to update your payment info, but it WILL NOT create a new club order. Just updates the current one.