So I want the lg optimus g pro, but on ebay and amazon are really expensive, anywhere really cheaper

On at&t is 99$$$$$!! And its contract and I have no idea where to buy it now but is there any where cheaper that I could buy it for like 100 .. Cuz that is what my dad said and when ever I look online its $ and the setting are right! And I live somewhere near canning town in London if anyone knows that place... But please help!!!!and I will ask another question on hair because I have brittle short hair and I want to grow it long and silky .. Thanks if you could spare time to answer my boring questions <3