Pricing: MR16 globe. Approx $30 from the Alternative Technology Association. T5 LED Tube supplier
Housings from Repco, was some time ago,flexible led strips but I think under $50.00 for a pair.
The housings originally had 50W Halogen globes as you would find in a domestic down light.
There are 10W MR16 globes available (equivalent light output to a 50W halogen) from 12v led lights
You can get different light spreads (concentrated or wide angle) and different colour temperatures.
Hope this helps.