It depends on where you get the projectors.
The little H3 minis have been discontinued, but the TSX projectors can be sourced from many places such as Ebay, or a good place is here...
http://www.theretrofitsource.com/
You would also need to get a wire harness, D2s bulbs and some ballasts to make everything work.
They also seel complete kits they have all the parts need, all you would have to do is the retrofit itself
http://www.theretrofitsource.com/index.php?cPath=24