Amazon.com: 1ft CablesOnline 3.5mm Stereo Male to Dual (Rd/Wh) Mono 3.5mm Blue Audio Breakout Cable, AM-601C : Electronics
Mono-to-Stereo Adapter Corrects Missing Sound from 1 Side
Hosa CMP150 Series 1/8" Stereo Mini to Dual 1/4" Mono Audio Cable (9ft) (2-Pack) - Walmart.com
Parts Express 3.5mm Slim-Plug Stereo Male to 1/4" Mono Male Adapter Cable 6 ft.
Hosa Technology Stereo Mini (3.5mm) Female to 2x 1/4" Mono Male Y-Cable - 6"
1-BUD Stereo-to-Mono Converter Mixes Left & Right Channels
Amazon.com: C2G Value Series One RCA Mono Male to Two RCA Stereo Female Y- Cable, Black (6 Inches) - 03177 : Electronics
Hosa YPP-136 Stereo 1/4-Inch Phone Female - Two Mono 1-Tip and 1-Ring 1/4-Inch Phone Male Y Cable (6 Inch)
10ft 6.35mm (1/4 Inch) TS Mono Plug to 3.5mm TRS Stereo Jack
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 :