Hi, looking into getting one of this for an UWA. Anyone can help provide some indication of prices (both new and also used if possible) that will help me to decide? Just need to know roughly the ballpark price and no need for shop name if the information is considered sensitive. The Nikon 20-24mm is the dream but may be out of reach but good to know what the street price in Singapore is like so can make the "final" decision. Thank a bunch.