I believe you can get them at Nazi's R us. Talk to Adolf, he'll hook you up
Seriously though, you should find out what brand and model no. the noid is and try and find a suitable replacement. Poke around online, you'll probably be able to find somewhere that sells the exact same thing, or a generic brand with the same specs. Might be easier than trying to track down a used one, and probably cheaper than buying one from SP.