I've been following this thread for a bit as my daughter hit HS and plays varsity soccer. As a result my wife and I need to volunteer for something. I chose the booth during JV games and immediately became the spotter using loaned binos. Ended up with 8X32 Vortex HD as they came well rated were $200 and available at the local gun show a couple weeks ago.

Spotting numbers on the jerseys for shots on goal, corner kicks, substitutions in and out along with free/penalty kicks has been easy after reading the instructions on setting up the binos. Obviously they are on the low side, 10% of the $2K mentioned above, but great on moving targets to identify small details from afar.