I could be wrong but I don't think the rock auto lights include bulbs so that's another expense.
That said, they do come up for sale in the BST section of this forum and Focaljet.com so that's another option.
Hatch Nation #13 : Rally Revolution #13 : ROTM Jan '13
It's Bryan, not Brian
RSVT-170 Build in Progress
Derusting Rusty Build in Progress