I just replaced all interior and plate bulbs with LEDs, all bought from Amazon.
The T10's for the plate lights came in a pack of 8 for only $10.50 with free shipping (and no tax) if you're an Amazon Prime member. The T10's are the same type for the courtesy door lights as well, so they could all be used if you thought 8 bulbs was overkill.
Here a link: Zone Tech 8 pcs 8-SMD T10 12V Light LED Replacement Bulbs 168 194 2825 W5W - White
Be careful about these. I just ordered and received mine. A third of them were blue instead of white.