I'm planning on constructing some retaining walls on my property. Some of these retaining walls will be 4' in height. I have lots of limestone that I plan on facing these walls with. For the construction of the wall I'm trying to define which direction I should go. I have lots of stone and sand on site and I could potentially by a cheap cement mixer (Lowes $199) and make up my own cement and pour within forms or I could install cinder block and fill. Which would you think would be the lesser expense and lesser labor involved? Either way I still may end up getting a mixer. With block I still need a footer and still need to fill the block but less concrete would be involved.