Amazon.com: Creative Sound Blaster X4 Hi-Res 24bit/192kHz External USB DAC and Amp Sound Card, Super X-Fi, Multi-Channel, 7.1 Discrete Surround, Optical-in, Optical-out, Line-in, Mic-in, Headset-in for PC and Mac : Electronics
Creative Sound Blaster X-Fi Go Pro USB SBX SB1290 3D Audio Sound Card THX 3D 54651173736 | eBay
Creative Sound Blaster X-Fi Surround 5.1 Pro USB Sound Card 54651173699 | eBay
Amazon.com: Creative Labs Sound Blaster Play! 3 External USB Sound Adapter for Windows and Mac. Plug and Play (No Drivers Required). Upgrade to 24-Bit 96Khz Playback : Electronics