Behringer XENYX 1002B Premium 10-Input 2-Bus Mixer with Preamps 9V battery Field Operation | Reverb
Dual-Channel XLR Audio Mixer w/ Preamp (CoMica) - Ikan
Amazon.com: Nady MM-242 4 Stereo / 8 Mono Channel Mini Mixer with mono/stereo mode, ¼” Inputs and outputs – battery powered, or use optional AC adapter : Musical Instruments