I have never seen on advertised in the past eight years. They were made by Erma in West Germany, and they were spring-powered and had a rather strange non-authentic hammer without a hammer 'ear'.
They were called the Erma ELG-10 in Germany, and you may be able to find on on the German website egun.de , a sort of auction site for firearms and air-rifles that some of the BBS community use.
Otherwise I suggest you have a look around, but if you want something better and more satisfying, get a Walther lever-action Winchester, powered by CO2. More powerful, accurate and fun than the Ranger, easily available in the UK.