I make my own yogurt (recipe is on the DIY Recipes page). It's excellent and I hope I never need to go back to store bought for any reason. I started to do it so that I wouldn't need to consume those plastic containers every time I eat yogourt (and we consume about 2 litres a week so that's a lot of plastic after a while) and it's cheaper than store bought, and it turns out it tastes better.
We also eat sour cream. Not a ton, but I figured that since I'm already making my own yogurt, I might as well take the extra step and make my own sour cream. I'm on my last store bought container now!
~ Lynn