Ebay offers Logitech Z313 Multimedia Speaker System for $30.59 (reg $59.99) with free shipping.

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Product Description:
You’re listening to music and online videos, watching movies and TV on your computer. But your built-in PC audio just won’t cut it. That’s where the Logitech Speaker System Z313 comes in, offering you the easy way to kick back and enjoy your music. Its convenient control pod makes it easy to control volume and even plug in your headphones. 25 watts (RMS) of power fills your room with big, balanced sound. The compact subwoofer fits into tight spaces and delivers deeper bass when you want to feel the beat. Plus, it’s a snap to set up. Just connect the speakers to the subwoofers, and plug the subwoofer into your computer. That’s it.

• Dimensions (Overall): 5.9 Inches (H) x 8.6 Inches (W) x 9.0 Inches (D)
• Electronics Features: Audio Streaming
• Operating System Compatibility: MacOS
• Connection Types: 3.5mm Jack
• Wireless Technology: No wireless technology
• IP rating: Not Specified
• Battery: No Battery Used