The first place to check for availability is http://www.sonystyle.com. The in Stock status does change depending from the country you live. We have seen that the NEX3 is in Stock almost everywhere and the NEX5 only in few countries.
Let's also check other big stores:
US -> Amazon has the NEX3 in Stock. Also BHphoto has the NEX-3 in Stock. And where is the NEX-5? Only Ritz camera does have the black model in Stock!
EUROPE -> The most lucky guys are our friends from UK and France! Amazon UK has the black and silver NEX5 in Stock and the same cameras are in Stock at Amazon France. Sorry german folks, you still have to wait on Amazon Germany
JAPAN -> As usual they get the hot stuff before anybody else: Amazon Japan has almost everything in Stock!