Need suggestion regarding laptop purchase

hi all,

I want to buy a dell laptop (studio)
i5-4GB-500GB-1GB (graphic)...is the requirement...
I have inquired in lamington road .....the price they have quoted is around
Rs 39000... but the same lappy in dell website customization costs very high around Rs 45000..


Why is that difference?
will there be any backdrops in the product?
what would you suggest?