I was checking test equipment depot's site after today's video (with the hp bench dmm) and noticed a few that might fit the 100$ category
Sperry DM6650T True RMS 10 Function Digital Multimeter 108$http://www.testequipmentdepot.com/sperry-instruments/multimeters/dm6650t.htm
This one I also see it's at walmart and sears and amazon and doesn't look that great with only 4000 count and 0.8% precision on dc v for example
Megger AVO410 True RMS Digital Multimeter 128$http://www.testequipmentdepot.com/megger/multimeters/avo410.htm
A bit expensive but looks like it has nice probes, isolated serial out, cat iv 600v, 6000 counts BUT worringly only 1.5 updates per second
Hioki 3256-50 150$http://www.testequipmentdepot.com/hioki/multimeters/3256.htm
even more expensive but apparently industrial grade, has locking mechanism for current
Have you tried contacting companies like TED (short for the one I linked) to see if they'd be willing to give you a few for review?
I understand you want a limited number of meters because you don't have as much time as before.
If it's also an issue of money, have you considered something like asking people to donate small amounts of money and then pick a person's name from a hat and give one of the meters to that person?
I'd be happy to give about $10 - with 15 people you have the price of a meter incl. the shipping.