One of the best kitchen investments I have made over the years is a grain mill. I purchased a K-tec Grain Mill over 20 years ago. (Wow, that makes me feel old).
At that time it was the only mill in my price range.
The investment has paid off. I have used the mill on a regular basis since it's purchase and it has never let me down. I do like some of the features on the new grain mills, but I am too frugal to buy another mill, when the one I have still works great.
I use it to grind wheat, rye, oats, corn, and spelt. It can also grind other grains and legumes, as long as they are dry.
I grind about 4-5 pounds of grain at one time. I store the flour in labeled, gallon size bags, in the freezer to keep the flour from going rancid.
I save money and have a healthy alternative to the flours I can buy at the local grocery store.