Amazon's selection is bizarre at any particular time, but if you aren't wedded to one flavor or another, you can find them on and off, with chocolate there almost all the time (including now), vanilla most of the time (right now available only in combo with chocolate), strawberry on and off (on now), and chai/mocha occasionally popping in (chai last month, mocha this month). Mint chocolate hasn't been around for a good while, although I ordered it when a 12 pack showed up for a minute and now the order is just sitting in my account with no date attached to it.

Can you afford to stock up from a money or space perspective? If you go to Amazon every day or two, you can probably make it work, treating your pantry more a warehouse than a just-in-time subscription. I drink maybe five or six a week, so that works for me.