YOu can get the bulbs at any auto parts store, some walmarts, Kmarts, etc. If they are sealed beam you need to know if they are Halogen or not, they will be different sizes if they are 4 lamp system opposed to 2 lamp system. If they are composite lamps you just need the halogen element bulbs. Do not touch the glass portion of the element bulbs or they can blow immediately just from the moisture from your fingers. You could have one of several problems but its not uncommon for one bulb to blow and surge power to the other causing both low beams to burn out. As stated check to see if the high beams work, and if they do you have a high probablility of blown lamps.