DD, we found the smallest child's wading pool at Wal Mart the cheapest solution to the ducks needing water to wash their becks out and swimming. Orscheln Farm and Home Store has some chicken tractors now starting at $250. upward, all built or just the 'holding' pens....you can assemble or pay them $25. for assembling. I have looked at them really close because it still might be the cheapest plan for us....I would put it inside a dog run we bult that is 5 by 15 feet with 8 foot high wire to prevent the varmits getting to the fowl.