Unfortunately, I don't have a place to get free manure. We are going to be getting some goats as soon as we get a little barn for them in the pasture that we've just had fenced, and I'm planning on getting a few rabbits, so I'll have manure from them, too. We do have the chicken manure out of our small chicken house.
I liked gardening in the square foot beds last year. Our tomatoes did really well until that scorching heat killed them. This is the first year we've grown any early crops in the square foot beds and I'm very pleased at the way our lettuce and green onions are doing.
If you are gardening in boxes, then I'd say you're pretty much doing square foot gardening!