Amazon has the Logitech X-540 5.1 surround sound speakers for just $69.99 shipped, originally priced at $99.99. This speaker system uses “FDD2 (Frequency Directed Dual Driver) technology to produce a uniform soundfield anywhere in the room.” Product page. Video overview after the jump.
Immerse yourself in the game using the selectable matrix mode, which automatically creates 5.1 surround sound from common 2-channel stereo sources. The compact satellites are wall-mountable, and a special clip lets you place the center channel speaker on top of most flat-panel monitors to reduce desktop clutter.