Used Phone for Sale at Silverdale Fixit. Are you looking to upgrade your mobile device? At SDFIXIT – Silverdale Fixit, you can get the latest electronic gadget without paying hundreds of dollars. SDFIXIT always stocked with the newest devices on the market and is available at affordable prices. Trade-in an old device, or browse our selection of premium pre-owned devices for sale. Stop in today or call/Text us at 360-900-2370 for information on our available devices for sale.