I've been hunting all over for cheap ones and trying to hold out for Dollar Tree and finally my patience was rewarded!
Dollar Tree released their spring ad yesterday and you can order them for site to store immediately. I got 8 of those babies for less than $10 with free site-to-store pickup in early January.
https://www.dollartree.com/Seasonal-Holidays/Lawn-and-Garden/Garden-Collection-Metal-Plant-Hangers-30-/1248c663c663p336429/index.pro?method=search