If you want to use it and not pay a ton for it, buy a Raspberry Pi and it's a free install. (Used to be included with the OS but now you have to go get it).
Obviously you might want to get a nice recent version of the Pi and splurge on getting the max memory, but...it's the cheapest way into Mathematica (and the Wolfram language) other than winning a copy.
Obviously you might want to get a nice recent version of the Pi and splurge on getting the max memory, but...it's the cheapest way into Mathematica (and the Wolfram language) other than winning a copy.