Making soy milk at home?

I know a person who actually does make her own soy milk. It is not something plan to invest in myself. However it can be done. I am not sure about cheaper but you are going to know exactly what is in it. IF you want cheaper than national brands like say Silk, you can try getting soy in powdered milk form from a health food store. IF you do, be sure though that you use a blinder. I from experience will argue with anyone who says powered soy milk can be made without one. Cows milk is still cheaper than the powder but it is the powder is cheaper than the ready made national brands.