You must not have looked on E-Bay very hard, because there's tons of headlights and turn signals for sale there. I don't think anyone makes after-market tails for the sedan though, just the hatch. That's fine with me, because the Altezza tails for the hatch are ugly as fuck, so I can't imagine that ones for the sedan would look any better.
If you absolutely have to do something with your tail lights, then buy some of the light tint spray and darken them...