Wasting hay isnt an issue for most people
start buying it by the bale and its pretty cheap. It is just dried grasses afterall.
There is a tutorial somewhere on this forum of someone building a wooden wall hay rack.
Any metal hay rack with a lid will work.
Bent NIC panel. Or cut a panel in half to be the sides and a full panel in the front with larger openings and some zap straps....
Lots of things can be turned into hay racks. All for cheap.
That thing you linked just looks overpriced.