Buy a roll of 6” concrete mesh and hog ring yourself some cages. It’ll be they last ones you ever buy.
This. Cut the bottom wire off so the remaining "spikes/ pins" can anchor into ground. If necessary one "T" post can give even greater stability.
I used 6x6-10x10 WWM cages for about 20 years (moved and didn't bring them along 20 years ago). I made mine about 18" diameter (about 5' length before bending) x 48" (or 60") high and placed in groups of 4 so the top ring tangent points touched then wired or zip tied them together. The 6" x 6" spaces allowed me to easily reach thru to the far side for harvesting.