Yeah, I'm hearing they're sold out of the stores. On the plus side, if you are interested, you can ask HP to notify you via their website. Retail stores who didn't participate in the fire sale are shipping their stock back to HP which is then selling it for the $99/$149 prices online.
Playing with it last night, I have no regrets. You can shut off most of the logging/monitoring features (which are on by default) for a good performance boost and I read you can overclock it from 1.3GHz to 1.7GHz pretty easily but I don't know that I'll bother. Folks are already working to port Android to it and I've heard people suggest that now the apps availability for it may ironically
increase -- wasn't worth writing them for 40,000 sold units but would be worth it now that 500,000+ units are in people's hands.
Even if not, I found some apps I liked, loaded up music, a few movies and seasons of Archer to keep me amused on the road, it browses the web, e-mail and plays Angry Birds so... win!