Albert Nyström has created a battery-powered DIY drum machine for $70
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Percussion Goblet Music Drum Machine Kit Acoustic Battery Drum Music Instruments Children Pandereta Musical Battery Aa50ed - Drum - AliExpress
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Amazon.com: IK Multimedia UNO Drum analog and digital drum machine with 6 analog voices, 64-Step Sequencer, USB and 2.5mm MIDI, 100 pattern presets, battery-powered and portable : Musical Instruments