Switchcraft AudioStix Stereo 3.5mm Female to Balanced Mono 318
Amazon.com: Disino 1/4 Mono to 3.5mm Stereo Adapter, Gold Plated 6.35mm TS Male Plug to 1/8 inch TRS Female Audio Connector - 2 Pack : Electronics
Amazon.com: Monoprice 107128 3.5mm Mono Plug to 3.5mm Stereo Jack Adaptor, Gold Plated : Everything Else
Amazon.com: Cmple - [10 Pack 3.5mm Mono Plug to 2x3.5mm Stereo Jack Adapter - Black : Everything Else
Hosa Technology Stereo 3.5mm Female to Dual Mono 3.5mm YMM-492
SPRODIO SC21 Stereo to Mono Converter, rca L/R audio adapter stereo to mono sum | eBay
Williams Sound 1/8" Stereo Jack to 1/8" Mono Plug Adapter ADP
3.5mm Mono Plug to 2x3.5mm Stereo Jack Adapter
1/4" Stereo Audio Jack Plug Adapter Single Male To Female 6.35mm Dual Mono Stereo Jack Headphone Microphone Y Splitter Converter - Audio & Video Cables - AliExpress
OSD Audio SMC21 Stereo Signal to Mono Converter and Ground Loop Isolator : OSDAudio.com
Monacor SMC-1 Stereo Mono Converter | Reverb
Monoprice Metal 1/4in (6.35mm) Ts Mono Plug To 3.5mm Trs Stereo Jack Adapter, Gold Plated : Target
MONACOR SMC-1 Stereo-Mono-Converter
6-foot 3.5mm Stereo to 1/4" Mono Audio Adapter Cable - C. B. Gitty Crafter Supply