Logitech Z-340
I've seen them go for as low at $55 at large retailers.
I have a set on my AlPB 12", used them on my G4 Quicksilver, recommended them to a PC neighbor, my brother-in-law, my father, my best friend - they were all amazed by these speakers, dynamic range, cost, control, design etc. It's a 2.1 speaker set-up with a standard 3.5mm stereo plug. Logitech uses neodymium rare-earth magnets in all their drivers, and ported sub-woofers with fibre-board cabinets - only the satellites have any plastic, and their stands can be swivelled around for wall mounting.
N.