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The Roland Cube Street is a great product for a musician on campus. Loud enough to fill a room or play outdoors. I only used it once last year (It was an impulse buy). It retails for $300 but I will let it go for $200.
It also doubles as a speaker - you can plug your computer, iPod, or any device in via AUX. Great sound quality.
Check it out here: http://www.amazon.com/Roland-Street-Two-Channel-Battery-Powered-Amplifier/dp/B000XALFYW
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