I think the HF S200 is dirt cheap at the moment.
It's several hundred bucks cheaper than the S21, and the only things you lose compared to that model is electronic viewfinder and the 64GB built-in storage. The rest is the same.
BUT BUT BUT! As I posted about a few days ago, I think they're approaching EOL. S100 was introduced around April 2009. The S200 was introduced around March 2010.
Spring has come and gone in 2011 with no successors. I believe there'll be new models soon, though I don't have any qualified knowledge to backup my belief.