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1pcs 3.5mm Audio Mono Stereo Male jack Plug 3.5 mm 2pole 3pole 4pole Right Angle Plugs for Phone Headset|plug 3.5|plug 3.5 mmplugs for phones - AliExpress
3.5mm Mono Plug Audio Converter Connector Adaptor To Stereo Jack Male To Female - Walmart.com
Vertical Breadboard-Friendly 3.5mm Mono Headphone Jack : ID 4031 : $1.25 : Adafruit Industries, Unique & fun DIY electronics and kits