BKK2 on 25 March 2009
With around 250k PS3s shipped between Russia and Poland PS3 should be comfortably past 300k sold in the entire region. I'd expect those two countries to make up around 2/3rds of the Eastern European market, and the difference between shipped and sold to be no more than 10% now, which would put my guestimate for PS3 at ~340k for the region.
That's a bit smaller than Benelux or Scandinavia where PS3 should be somewhere around 500k, but it's quite possible that Eastern Europe will be a bigger market for SCEE than either of those two in the future.
