Sigma DP1x drops to $390 [update]
The Sigma DP1x is on a price-dropping trend again. As of the time of writing, you can get it for $390 with free shipping at Amazon by Amazon. We are placing a "falling knife" watch on it. In the fall of 2012, it dropped as low as $250 before it started climbing up in price.
UPDATE (10:18pm ET): The price is now $350 via a 3rd-party seller with the order fulfilled by Amazon. Amazon's own price remains at $390. Thanks to PoA for the alert in the comments!
Also keep in mind that Sigma has multiple DP-series models, so be sure to look into them if you are not familiar with all the different models. The latest models have the slightly larger Merrill APS-C-ish sensors, growing from the 1.7x-ish sensors of the earlier Sigma-Foveon cameras.