At one point, (before I was forced to move to an apartment and lost
most of my gardening area) we had a compost barrel. We bought it as
such, but it was a fairly simple compost. Metal drum, door in side
(that latches, that's important) that is set on a frame with pivots.
There was a handle at one end of the barrel and someone would go out
there and give it a good turn once in a while. After a couple months,
line a bag up under the door and let the soil drop out.