ASUS IO:4US/LN/K/MS/3UDIO/33W

Creative Labs Sound BlasterX AE-5 Plus Internal 5.1 channels PCI-E

£109.90

StarTech.com USB Stereo Audio Adapter External Sound Card

£22.93

Manhattan USB-A Sound Adapter, USB-A to 3.5mm Mic-in and Audio-Out ports, 480 Mbps (USB 2.0), supports 3D and virtual 5.1 surround sound, Hi-Speed USB, Black, Three Year Warranty

£19.39

Creative Labs Sound Blaster Katana V2X Black 90 W

£249.72

Creative Labs Sound blaster audigy fx v2 Internal 5.1 channels PCI-E

£46.56

Lindy TosLink Budget opt.SPDIF 2m

£16.88