The original poster is a coach, so I assume she understands injuries, and will do the research, and won't let kids play with it unattended.
Here is one for $35 - small and no outside nets, so probably not for stunts.
A local skating school has the kids play on trampolines. I took one of their adult ice dance clinics. The rink had reserved the exercise room for other purposes one day, so the coaches cheerfully brought out the trampoline. [These are the coaches that make everyone jump on and off bleachers. They also make the kids run up and down steps. A bit hardcore.] It was a lot of fun, though some adults were afraid to try, and some of us were heavy enough to touch the surface to the floor while jumping. Adult models are stiffer.
One recommendation from the net I don't understand: it said it is safer to wear appropriate exercise shoes. Why not go barefoot?