Amazon.com: tisino 1/4 Mono to 1/8 Stereo Cable, 3.5mm TRS Stereo to 1/4 inch TS Mono Interconnect Cable (Mono to Stereo Adapter) - 3 feet : Electronics
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Hosa CMP150 Series 1/8" Stereo Mini to Dual 1/4" Mono Audio Cable (9ft) (2-Pack) - Walmart.com
Castline Gold Stereo to Mono Cable | Reverb
SUM-QSPP | Stereo to Mono Summing Cable 1/8" Male TRS to 1/4" Male TS
Neutrik Mini Stereo 3.5mm Jack to Mono Cable, 6.3mm 1/4" Lead PC/Laptop to Amp | eBay
3.5mm Stereo Male to Mono RCA Stereo Male Adapter Cable - Micro Connectors, Inc.
1/4 in TS to 3.5 mm TRS - Mono Interconnect | Hosa Cables
Amazon.com: 3ft CablesOnline 3.5mm Stereo Male to Dual (Rd/Wh) Mono 3.5mm Blue Audio Breakout Cable, AM-603C : 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)
1-BUD Stereo-to-Mono Converter Mixes Left & Right Channels
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 :