Here's where you preorder from the US:
http://www.newark.com/raspberry-pi/r...cba/dp/83T1943
I was able to get to that page before, but they had a $20 handling fee, so I didn't order. Not even shipping, just handling! They've fixed it now, though, so I have also ordered mine. Which I did before I posted the link, just in case of cutters.
It gives the estimated shipping date as April 3 or something.