I am not a natural user of e-bay, but daughter lost her smartphone, and the offers from Voda-ugh, her supplier, were ugh. I suspect they wanted a full year's p & l from daughter, just cos she lost her phone.
So I went on to e-bay.
There are lots of "Samsung Galaxy S 2" phones on there. I really like that phone. They all seem to sell at circa £120 . Probably 2 years old - end of contract.Some of the "buy now" phones are 120 to 150.
(With samsung, unlike i-cost-a-shed-load-phones, loading a sim does not lock up your phone.
So I bought one. Through an auction. It came quickly, and was exactly as advertised. Obviously there is some risk, but the payment method - pay-I'm-not-your-pal provides pretty robust protection.
Have a look. Read the guidance before bidding!