Save your money. You wont find anything decent for that price.
You can find 'box' systems which are really DVD players with cheap attached speakers. This does NOT usually have HDMI and does NOT have inputs from anything but left/right stereo. (This will work from your MP3 player).
Save up for a full 5.1 system with a full-sized receiver. Onkyo makes some budget systems that would be a good start. But you need a bit more money.
Hope this helps.
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