We made a pasture-dragging device
For free! Just got a twin-size mattress and cut off the material. It was pretty easy to remove the padding/cloth -- cut around the sides and then pulled the staples out. We were left with just the "cage", and it's the perfect thing to tow behind the atv and break up the manure out in the pasture without ripping up the grass. I thought we would need to weigh it down but that wasn't necessary.
I had never heard of this before, but my husband's friend suggested it and it works great. And it fit our budget, too.