Anywhere that has stuff like woodward in NY, or close like Vermont? I have used the search bar yes, but I am double checking, someone should make on if there is not.
Adding on to what broto said, NH has about six tramps at the freestyle america facility, and an airbag that they drive to. Lake placid has water ramps, with two tramps next to the water ramps, and tramps at the Olympic Training Center.
Oh word, I am going to check out Lake Placid stuff, can you just pay to use their facilities or do you have to do the camp? and I forgot about SkyZone.
I'm not entireley sure. I do know that camps like freestyle america and other freestyle teams rent out the ramps for certain amounts of days. There might be some sort of "open ramp" that you could just pay per day or something like that.