Amazon.com: Onown Pickup Wiring Kit PIckup Piezo 50mm Sensitive Transducer Pickups Prewired Amplifier with 6.35mm Output Jack for Cigar Box Guitars and Acoustic Instruments : Musical Instruments
Amazon.com: Luvay 12Pcs Piezo Pickup Transducer Prewired - 27mm Contact Microphone Trigger - Discs Elements for Acoustic Instrument: Guitar, Drum, CBG etc. with Leads : Musical Instruments
Amazon.com: Parts Express SPST NO Momentary 22mm Stainless Steel Waterproof Touch Piezo Tamper Proof Switch with Red Ring 3-24 VDC : Industrial & Scientific
Amazon.com: 3-pack 27mm Piezoelectric Disk Elements (Contact Pickups) with 2" Leads : Musical Instruments