If you are living in one of the listed countries previously announced by Google and you were just waiting for Google to announce its new Nexus lineup, you might want to check out the Google Play Store as all three now have their own place there.
The "new" or revamped, or whatever you decide to call it, Nexus 7 now proudly stands at Google's Play Store with "now shipping" status. The 16 and 32GB versions of the Nexus 7 can be yours for a mere US $199 and US $249. The 3G 32GB model is also listed at US $299 but it is still not available but only listed as "coming soon".
The Nexus 4 smartphone and the Nexus 10 tablet also got their own piece of Google Play Store with a "register for email updates" option, while shipping is expected to start on November 13th as previously announced.
You can find them here.