I found Admiral easily enough on Ebay. Its a dreadful film though. There are lots of other Russian Civil War films available on Ebay from time to time, films like "At Home Among Strangers" (excellent) which has a Michael Caine lookalike as the bandit chief, or "White Sun of the Desert" a cult film in Russia but piss poor in my opinion. Look them up on Wikipedia or Google and you'll find quite a few. In Russia the DVDs are often available for no money but prices here vary enormously. Most have terrible plots and dialogue but some great action scenes - even Admiral which more than makes up in the latter's case for thre angst filled looks of longing that make up most of the film. You'll wish they had thown his body into the ice an hour earlier!
Also have a look at "The Good, the Bad and the Weird" a Korean BofB bandit film set in 1930s Manchuria and now available on DVD in UK (saw an ad for it on TV the other night). Its an absolute cracker of a film and is now being used as teaching material in collage courses, so innovative is the direction. The train holdup sequence is simply amazing for the length and quality of the camera action.