You found 2 products in Sound Cards - Surround Mode

Dell 510-10141 Sound Card
Plug-In Card, Surround Mode, PCI interface
1 store offers from £67 - £67

Creative Technology Creative X-Fi Xtreme Fidelity Souind card - USB Sound Card
External, Surround Mode, USB interface, 24-bit
2 store offers from £49 - £124