There are a number of 'used spare finder' sites on line. You enter the part you need on the site free of charge ,possibly with a photo of the wheel style, and maybe its part number taken from another wheel, and a number of car dismantlers may then list that wheel specifically for you with their price including postage. A bit like personalised E bay listings. You should find more than one such site on google. I cant remember which one I used but I was able to pay using their secure on line payment system.