These ever show up on Ebay anymore? They look just awesome. I thought I found a site that had one for sale then my heart fell a few stories when I noticed the SOLD OUT sign at bottom.
Maybe pick up the Palisades Queens instead? Might be a bit smaller but I love the pose. The Sideshow does have a superior paint job from what I heard but I really do love my Palisades Queen and I saw a few on eBay that's going for pretty decent prices. Check them out.
SS made a brief work-in-progress preview video of an Alien Queen Egg Chamber/Nest piece back in October 2010 if I remember correctly. Obviously, it has been quite some time since then and, to my knowledge, there hasn't been any solid information since. Maybe 2013 will finally be the year that we see/hear more about this piece...