Per memory, you can also do it at NASA Space Camp as an additional, optional activity. (Or, at least, appropriately aged children can)
I'm not sure how much it was: I did it back in the 90s.
It was a prop plane, but I remember probably ~5-10 seconds of perceived weightlessness. Which seems longer than you might expect when your stomach and contents are suddenly floating freely in your chest cavity. ;)
When the Mythbusters took a ride in a U2 there were several days of training including how to operate the pressure suit required for the trip. I don't know of any commercial U2 rides and I assume it would cost way more than the Zero G plane ride.
Even less! 1.94% of the cost. :)
Part of the experience that I'm looking for is the perspective of seeing so much of the planet at the same time Ride in a U2: https://www.youtube.com/watch?v=w-COlil4tos
You can get a ride up pretty high (and fast in a Mig too) https://migflug.com/flights-prices/mig-29-edge-of-space/