I breed my own, pinkies are pretty expensive where I am at, I would end up buying bulk. So I started breeding and have had some good success with it. I feed the mice so I know what food they are taking in, on a daily basis.
I freeze the pinkies, fuzzies for feedings later on. The only thing I don't enjoy is the smell. Mice stink.
To me putting up with the smells and extra cage cleanings is well worth the expense of paying for frozen.