While we're necro-ing threads, I thought I should point out that 2013 prices actually do appear to have come back. $7,100 for a series 1 1btc on ebay a few days ago, and 2.1btc for one on this forum also in the last few days.

I sold an MS-62 series 1 myself for 1.6BTC just a month or so ago, and thought I was getting a great price. Now I'm not so sure!