3.5mm Stereo Jack to 3.5mm Mono Plug Adapter - HamiltonBuhl
Mono-to-Stereo Adapter – ProCAT
Stereo to mono converter cable, 50cm
Stereo-to-Mono Adapter — ADCO Hearing Products
3.5mm Mono Plug to 2x3.5mm Stereo Jack Adapter
3.5mm Stereo Plug to 2x6.35mm Mono Jack Adapter
6.35mm Stereo Plug to 2x3.5mm Mono Jack Adapter
Monacor SMC-1 Stereo Mono Converter | Reverb
Amazon.com: 3.5mm Stereo to Mono Adapter, 2 Pack 3.5mm 1/8" TRS Stereo Male Plug to 3.5mm 1/8" Mono Female Jack : Electronics
Hosa Mono 1/4" to Stereo Mini Adapter Cable (5 feet) Adapts a 1/4" TS jack to 3.5mm stereo minijack at Crutchfield
Williams Sound 1/8" Stereo Jack to 1/8" Mono Plug Adapter ADP
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
Stereo Mono Converter | 20 Audio System Home | Audio System 8 1 | Audio Adapter - Stereo - Aliexpress
3.5mm Stereo Mono Male to Two 3.5mm Stereo Female Splitter - Micro Connectors, Inc.