dr sears has some great info on his web site about yougurt
you can always make your own if you cann't find whole milk yougart at your store.
Its a very easy project and you don't need a fancy yougurt maker
you can use a thermos.
this is instustions on how to make a gallon but you don't have to make that much... you can cut it down to a cup if you want.
I normaly use 4 cups of milk to about 4 tablespoons of good starter.