Get three decent sized wooden pallets and six cheap pound-in fenceposts. Arrange the palets in a C-shape supported by the fenceposts. Something like this
except they screwed 'em together and I think that makes a weaker structure. More support if you pound in fenceposts behind the pallet, in my own humble opinion.
Throw in garbage.
Turn with pitchfork every now and then.
If you feel like spending a hundred bucks or so, Ace on Willy's had some last I looked.