Amazon.com: Tascam US-4x4HR 4 Mic 4IN/4OUT High Resolution Versatile USB Audio Interface for Recording, Streaming, Podcasting, Songwriting : Everything Else
TASCAM US-4X4HR 4-Channel USB Audio Interface | Guitar Center
Alesis Multimix 4 Usb Fx 4-channel Mixer With Effects & Usb Audio Interface : Target