WD Elements Portable 1TB USB 3.0 External Hard Drive (Black) On Shopclues @ Rs. 3689
http://www.shopclues.com/wd-elements-1tb-usb-3.0-external-hard-drive-3.html
about product :-
Adding extra storage for your videos, music, photos and files
Transferring data at maximum speed with USB 3.0
Using with USB 2.0 now and USB 3.0 when you are ready
Using with Windows PCs

Price comparison:-
paytm @ Rs. 3787 (use coupon code ; HDD500)
https://paytm.com/shop/p/wd-elements-2-5-inch-1-tb-external-hard-disk-black-cmplxwd_elements_1tb_black_168
Amazon @ Rs. 3699
http://www.amazon.in/gp/product/B008GS8LT0
snapdeal @ Rs. 3952
http://www.snapdeal.com/product/wd-elements-25-inch-1/131655018
flipkart @ Rs. 4199
http://www.flipkart.com/wd-elements-2-5-inch-1-tb-external-hard-drive/p/itmdmhdqfhr4ndhq
ebay @ Rs. 4091
http://www.ebay.in/itm/WD-Elements-Portable-1TB-USB-3-0-External-Hard-Drive-Black-/271891470539
infibeam @ Rs. 4111 (use code STRIKEOFF5, then payment via payumoney)
http://www.infibeam.com/Computers_Accessories/western-digital-wd-1tb-wd-elements-portable-usb/P-coac-37253667708-cat-z.html