I do own a Helios 44M3 which uses that special Russian two ring aperture. (The second ring working like an A-M switch, but opening and closing the aperture seamlessly)
I can really recommend that lens. I found a Russian shop on ebay.de who ships worldwide without fee (for some offers). I ordered only one batch of lenses from them so far, no problems there.
They offer quite a number of M44 variants, not exactly cheap but without shipping fee...
They also have the Helios 77K-4 which is similar to the 44 (I think it's based on the same Zeis formula) and comes with a K-Mount! I also recommend that one, as stated here:
https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/152382-helios-...used-lens.html
Last edited by mano; 08-11-2011 at 12:01 AM.