Scottyee is right, I don't think you'll find one for the $100 price range... I think I saw a really basic one by digitech the other day and that was nearly $300.... Ebay would be the place to look
Squeak
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GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.