Amazon.com: Plugable USB Audio Adapter with 3.5mm Speaker-Headphone and Microphone Jack, Add an External Stereo Sound Card to Any PC, Compatible with Windows, Mac, and Linux - Driverless : Electronics
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Sound Blaster X4 - Hi-res 7.1 External USB DAC and Amp Sound Card with Super X-Fi® and SmartComms Kit for PC and Mac - Creative Labs (United States)
TASCAM US-4X4HR 4-Channel USB Audio Interface | Guitar Center
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USB-AC | External USB Stereo Sound Card Adapter for PC & Mac | Movo
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Plugable USB Audio Adapter – Plugable Technologies
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USB 2.0 External Stereo Sound Adapter with Optical SPDIF Output - SD-AUD20101