I ordered this 40-inch Spring Mini Fitness Trampoline designed for adults, with a 3-level adjustable foam handle and a foldable design.
It turned out to be bigger than I expected but was fairly easy to assemble—I had it put together in about 20 minutes, though I had to redo the poles after placing them in the wrong spots to match the handlebar holes.
I'm not sure how simple it will be to fold back up; when I tried, it seemed more time-consuming than I wanted to deal with, so for now it's set on its side until I find a permanent spot or an easier folding method.
It feels very sturdy, and I think it will last a long time.