For some reason the headlights on my 2000 are like new, not fogged up at all... does this mean they will some day with age, or does it just happen to some lights but not others? It's also possible that my lights are not the original ones, and the previous owner switched them out, so who knows. They are stock ones though.

However my brake light cover is all fogged up, does anyone know where I can get a new one?

 

Its possible that the previous owner replaced the headlights before you. If you want to keep them in good condition you should regularly clean/polish and used something like Mothers Power Plastic or Meguire's PlastX. Or you could always get clear protection covers for them.
http://www.afterthoughtsauto.com/caclprlish1.html

As for the third brake light lens I couldn't find it on Ecklers. You could always try.
http://www.rockauto.com/catalog/raframecatalog.php
or
http://www.yearone.com/

 

Thanks for the tips I never thought of using the protective stuff for the lights. I'll keep looking for the lense