not sure the easiest way to cut it out, depends what you have access to?
my car is on a rollover jig so its easy to get to, but i guess worst case is an angle grinder or reciprocal saw from the boot and then from behind the rear seats.. if you can leave about 20mm of floor around it then that would be easier for me, but see how you go.
no footballers here. but i'm sure Aust post will take it. shouldn't be more than $30 from there.
what condition is it in and whats it worth?