It doesn't look ricey, especially considering the fact you can only replace the single-wedge based bulbs in your car. There doesn't seem to be an alternative to the long steel-tipped bulbs that go into the footwell and the main center ceiling light or your rear license plate lights on this site. Can you live with that?
And ya according to these guys they have resistors built in, meaning these things can get mighty hot. It's a risk, but I doubt you'll have interior lights on long enough for it to do anything at all.