HOSA YMP-137 Stereo Breakout Y Cable - 3.5mm TRS Stereo Male to Dual 1/4" TS TS Female Jacks
Amazon.com: J&D 1/4 inch TRS Stereo Y Splitter Insert Cable, Gold Plated Copper Shell 6.35mm 1/4 inch TRS Male to Dual 6.35mm 1/4 inch TS Male Mono Breakout Cable, Audio Cord, 3 Feet : Electronics
Rock n Roll Rentals - Stereo Male 1/8" AUX to 2x Mono TS 1/4" Male Y Cable (A206MPY)