Make your own yogurt.
We were spending a small fortune each week on yogurt. Recently, we bought our own yogurt maker (for about $39) and have been making yogurt ever since. We use plain, organic yogurt for the starter and locally produced organic whole milk. I divide the quart container into 4 equal amounts and freeze three of the amounts in glass jars. No more plastic containers to throw away and we can flavor it however we choose.