There's also a Heter that if something plugs in, it doesn't need Tevilah since it is considered Mechubar LeKarkah. I believe I heard this quoted in the name of RMF.
Either way, I've always heard that that Heter combined with giving it to a non-Jew is sufficient for something that plugs in, especially if there is concern that one can't tovel something properly due to fear that it would break.