Moukey 4-Stereo Mini Audio Mixer, Ultra Low-Noise 4-Channel Line Mixer for Sub-Mixing, DC 5V Audio Mixer with USB Cable, As Microphones, Guitars, Bass, Keyboards or Stage Mixer-MAMX1 - Walmart.com
Behringer MX400 MicroMIX Ultra Low-Noise 4-Channel Line Mixer Pro Sound - Newegg.com