Something to consider....
It might be overkill but I usually sweep the whole set of exterior lights every so many years or when I get a differant car. It's not very expensive and I know all the sockets, lamps, and the wire near them is ok. Tracking down intermitant lamps is a pain in the butt.
The regular lamps, the whole set, usually is less than $20... The high mount brake bulb, if you have it runs $6.50 to $10 depending where you get it. Cheapest place I've gotten lamps is Wallmart. The high mount bulb was under $7 there. was $9.99 at shlep boys.
A front or back light bulbs are obvious to most people but don't overlook the front side marker. that's tied into the turn signals too.