Trampoline help

ok so heres the deal, i dont have a trampoline and i really have wanted one for a while.  The neighbors across the street from me are getting divorced.  The couple has 2 little girls. one is like 8 and the other is 6 i think.  Anyway the two girls go to waldorf school and there kind of bratty.  The house is staying with the dad and i really want their trampoline.  Its a piece of crap but i dont care. It has a net that saggs in like 3 1/2 ft.  The poles holding it up are all bent and rusty. The girls also dont use it ever.  I havent seen them on it once in years.  And when i walked over there some lady  answerd tthe door (not the mom) and i asked if they would consider selling it / giving it away. She said no because the girls will be there half the time still.  I just said thankyou and walked away butt im really mad. now the girls are gonna be using it half of the time they usually do which is 0 times per week. what should i do to try to get it.