Headphones Adapter for Piano Keyboard, 2-Pack 3.5mm 1/8'' Female to 6.35mm 1/4'' Male Jack Plug Stereo Adapter Gold Plated for Electronic Piano, Guitar, Drum - Walmart.com
Amazon.com: 6.3mm 1/4" Male Plug to 3.5mm 1/8" Female Jack Stereo Headphone Audio Adapter (Pack of 10) : Electronics
3.5mm Stereo Plug to 2.5mm Stereo Jack Adapter
Amazon.com: ANDTOBO 1/4'' to 3.5mm Stereo Pure Copper Headphone Adapter,3.5mm(1/8'') Plug Male to 6.35mm (1/4'') Jack Female Stereo Adapter for Headphone, Amp Adapte, Black 2-Pack : Electronics
Amazon.com: Monoprice 107160 3.5mm Stereo Plug to 3.5mm Mono Jack Adaptor, Gold Plated : Musical Instruments
Amazon.com: Duttek 3.5mm Male to Male Audio Adapter, Metal Silver 3 Pole 3.5mm Stereo Jack to 3.5mm Stereo Jack Adapter, 1/8 Inch Male to Male Audio Headphone Jack Coupler Connectors - 2 Pack : Electronics