First, the Infinite Response folding keyboard. I’ve seen folding keyboards before, but never one this nicely made. Even has a magnesium chassis.
Second, the Fender electric version of the Takaratomy Air Guitar. Now available from acgears.com. They also sell the acoustic version that Matrix ran a video of long ago, plus the FM3 Buddha Machine.
Also the Ta Horng iSmart roll-up soft keyboard.
And MiJam’s Pro Air Drummer. You can still buy some amazing gadgets at Toys R Us. In fact, MiJam makes all kinds of clever and great music toys. Most of which Matrix has never mentioned……