Find me a reliable source

Hi, I am looking for somebody to find me reliable and cheap sources for unlocked used iphones from any of the these countries: UK, Germany, Italy, Spain, France. You should be present in one of these countries and will be in charge of finding, testing, buying, and sending the iphones to the address of the shipping company in your country to ship it to me. You can search for used unlocked iphones in nearby shops and send me images of the phones you find along with their price. If I like the quality and price of a unit, you'll have to test it and make sure it has no defects, buy it and send it to shipping company. Payments will be through freelancer only.