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Monoprice 3.5mm TS Mono Plug to 3.5mm TRS Stereo Jack Adapter, Gold Plated - Walmart.com
10pcs 3.5mm Audio Jack Pcb Mount Screw Metal Nuts Mono Stereo Phone Plug 2 3 4 Pole Connector Through Hole Panel Mount Thread - Connectors - AliExpress
Amazon.com: Monoprice 6inch 3.5mm Stereo Plug/2 RCA Jack Cable - Black : Electronics
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3.5mm (1/8) Stereo Audio Plug Terminal Block : ID 2790 : $2.50 : Adafruit Industries, Unique & fun DIY electronics and kits