Last I checked it was about rm200-300 per down light for their cheaper range    But using that in a regular house is over design... 

go to shops that sells to project and you will find better light fixtures there. Most retail shops by the roadside sell cheap china lights with little regard for quality. 

Best is to buy from 'real' brands, not some brand less fitting. Look and see if they have websites or some brochure at least. Read up and see if their fittings have any special features - long lasting, wide angle throw, high efficiency, etc... Then you know that the fitting is not some cheap copy.