I purchase a bulk roll of 9 ga wire and cut my own. Not sure if it was any cheaper than the pre-made hoops, but the store 2 mi away had it on the shelf so it was too easy. I did cut the first few way too short just by eyeballing the length needed plus I had to remember the part that ends up stuck in the ground. Duh. Elliot Coleman has several books that include sections on row cover, etc. Four Season Harvest is one I have that comes to mind.