From yesterdays Linux Insider
The Nokia N900 will be available in select markets starting in October at about $713. It's not likely to come to the United States any time soon.

"Nokia has other things in the hopper for the U.S. market, namely growing its presence and building smartphones for CDMA networks," IDC's Llamas explained. "It could be a while until we see the new devices here."
http://www.linuxinsider.com/story/67971.html

This, if true really sucks. If the phone were subsidized by T-Mobile it would go for about $250.00 to 350.00 with a one year contract. Now you would have to pay full retail and if the phone is not "officially" for sale in the United States you could have problems if you need to use the warranty. The fact the phone is not up on the USA Nokia website is a bad sign as well. Bummer if true