I found this deal from e2save for a Sony Ericsson K850i Green "Clearance" Phone on a 12 month contract with Orange Canary £30 with £75 Cashback. The phone is free with this contract.
So you pay £30 x 12 = £360. Then you claim £75 Cashback over five months making a total of £285 for the contract. So this is the net codt for the phone and you also get 250 minutes per month for a year.
You can also claim £36.50 via Quidco.
I think this is the best deal for the K850i, right?