You can get replacement bulbs in any well-equipped automotive shop...just be sure to get the proper wattage. The wrong bulbs will seem to work fine, but they can cause some indicator lights on the dash to light up, forcing you to track down non-existent problems.
2009 ML350 (84K) - Family vehicle
2001 CLK430 Cabriolet (71K) - Wife's car
2005 BMW 645CI (124K) - My daily driver
2012 Mustang V6 (60K) - Daughter's car