Vistron 350W 5.1 Surround Sound System With Subwoofer is just £22.92 inc p&p from Ebuyer.com
If the direct link doesnt work, use the Quickfind code: 119696 to do a search. Looks like a bargain to me...
Description : With 350 watts P.M.P.O., this compact 5.1 subwoofer system offers a clear sound. 5 satellites and 1 subwoofer can be positioned in the room as you wish and permit perfect sound reproduction. Just connect your surround system to your 5.1 sound card or DVD player using enclosed cables and experience your own home cinema.
Features : Subwoofer system with five satellites | 350 watts P.M.P.O. | Volume control | Power on/off | Cables enclosed | Satellites suitable for mounting on the wall | For connection to: 5.1 sound card | 4 channel sources or DVD player with surround decoder