Roof spotlights - advice required

Ok I want spotlights on the roof............but on a budget!!

I have the roof bars but the thule bars to fit it in halfords are £40 and ebay are not much cheaper, so any ideas??

Also need rectangle lights? Any cheap places? Halfords for four are £56, disgusting, and cant find any on ebay just chrome round ones that I have on my other mav.

(might even just bolt them to the roof but the sunroof takes up a lot of that)

Thanks