I wanted to buy a SIM free Note 4 that was unlocked, so I could get a Three pay monthly SIM. I thought I would see whether it is possible to buy direct from Samsung (unlocked, not branded by network) and found going price of 599.99. I then decided to go though Quidco/Topcashback so closed the page so I could start again being tracked from Quidco/Topcashback. Upon closing the tab, a Samsung pop up window came up saying I could have a 5% discount if I came back and ordered. So I choose that option and got the phone for 569.99 plus some tracked discount with Quidco/Topcashback.
For what I was looking for, I thought this was a good deal. Not everyones cup of tea I am sure.