I bought 2 of these from home depot (except they are like 16' wide instead of 25' and incidentally only $24):
I am doing a "pallet project" wherein I've built a "tiki hut" bar out of old pallets, within a large area inside of metal pipes from the 1950's used (I think) for clotheslines:
I don't necessarily feel like it has to be enclosed (fenced) on all 4 sides, just the 2 shorter sides of the rectangle.
I put one up on one end by leaning it against the metal poles then putting 4 tall skinny wooden stakes in on each side to hold it up straight. This did OK, but not great -- it's still loose and slumps a bit. I think the wind will blow the whole thing over this weekend.