Amazon.com: 3.5mm Stereo Male to Dual 3.5mm Mono Male Audio Cable, 1ft 3.5mm 1/8" TRS Male to 2 x 3.5mm 1/8" TS Male Y Breakout Cable Splitter Adapter for Headphone, Speaker :
Amazon.com: UGREEN 1/8 to 1/4 Stereo Cable 3.5mm TRS to 6.35mm Audio Cable Guitar to Aux Male Cord with Zinc Alloy Housing and Nylon Braid for Guitar, Laptop, Home Theater Devices, Speaker
Adapt 2.5mm Stereo Plug to Larger Stereo 3.5mm Audio Jack
3.5 mm Male to 6.35 mm Male Stereo Breakout Cable - 1010music LLC
Right-Angle 3.5mm Stereo Plug to Pigtail Cable : ID 1700 : $1.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Stereo audio adapter, 3.5mm F Jack & 2.5mm M 3-Cond Plug