In central Illinois, schools have checks for us as we get to the field. I think some of the older guys would walk away if the check wasn't there when they got there.
As far as rate, schools all pay different rates for different levels. There is no "set" rate. Especially the rural schools, because they have a much harder time getting umpires. They pay higher as most umpires have to drive 30+ minutes (that's a long time around here to drive to a game) to get to the school.