Can the PA-3B or PA-3C adapters be subsituted with anything from Radio Shack? There much smaller and I was curious if you could get the same thing through Radio Shack for less.

Thanks.
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.