One cost for another

With the knowledge that I'm going to most-likely be gluten/wheat free for the rest of my life, and the mounting costs of the flours, I'm thinking about spending the money for a grain mill.  I saw at Bed Bath and Beyond (online) a grain mill attachment for a KitchenAid mixer, that runs about $150.  That was the only grain mill I saw there.  Nothing at Linens N Things online.  

I know I need to do more research on them, but when a pound and a half of GF all-purpose flour is about $6, and five pounds of wheat flour is only $2, at most, grinding my own flour is sounding better and better.