Now there is a good chance you'll have to replace the burner and the lava rocks which is why it was probably thrown out.
The good news is that the grill box is made of aluminum and it's probably worth $5 at the scrap yard. You can find thrown out grills all over the place and at 5$ a pop this can add up.
(Hmm. Maybe I just found a special report.
I lived a whole summer by finding and selling scrap)
The only thing is you'll have to remove all the parts from the grill including the stand.
All it takes is a hammer.

Good luck.
Henry