You can sell them or give them away as long as they haven't been used yet.
You could do these at Universal: Shrek, Jaws, Earthquake, Twister, ET, Terminator, Horror Makeup show, Beetlejuice show, Jimmy Neutron and possibly Back to the Future (it doesn't have any spins but the ride is pretty rough and can disorientate you if you have a balance problem.)
At IoA, you might be able to do Spiderman. It has some spinning but very little. It is 3D and feels like you are falling but you aren't really falling. You can do Poseidon's Fury and Cat in the Hat (ask the ride attendant to give you a car that doesn't spin) and the Sinbad show.