3.5mm (1/8) Stereo Audio Plug Terminal Block : ID 2790 : $2.50 : Adafruit Industries, Unique & fun DIY electronics and kits
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Amazon.com: SiYear 3-Pole 3.5mm Stereo Headphone Jack Male Plug Repair Replacement Solder Adapter, 3.5mm (1/8inch) Solder Type DIY Audio Cable Connector(2PACK) : Electronics
3.5mm Stereo Plug
Amazon.com: CableCreation 1/4 to 3.5mm Adapter Cable, TRS 6.35mm Male to 3.5mm Female Stereo Jack Audio Adapter for Amplifiers, Guitar, Keyboard Piano, Laptop, Home Theater, Phone, 1FT : Electronics
JR8013/7M - Pro Signal - Audio / Video Cable Assembly, 3.5mm Stereo Jack Plug, 3.5mm Stereo Jack Plug
Standard Series 3.5mm Stereo Mini Plug to Plug Audio Cable 15ft