A city-by-city guide to Australia's secondhand electronics market, covering how buyers and sellers operate differently across Sydney, Melbourne, Brisbane, Adelaide, Canberra, and Darwin. It includes practical tips on what to check before buying (IMEI, battery health, proof of purchase), the best times of year to find deals (January and EOFY), and why local platforms like Dealin offer a genuine advantage for inspecting items and avoiding interstate hassles.