In our game Friday night, the Home Team had ball boys on each sideline. We had to replace one over enthusiastic home team ball boy before the game (basically, not let him be on the visiting side line).
It took the H/U and Ball boys a series or two to work it out, but once they did, the U would get the home teams ball from whatever sideline it was closest too.
Worked pretty well. We were averaging 7-9s per play getting the ball spotted. The teams didnt move that fast on a hot, muggy evening.