First of all, welcome to the T&TH site. We look forward to hearing from you.
Federal has shipped lots of the new 20 gauge Heavyweight product in the last few weeks. The #6 shot went first and then the #7 shot. If your local dealer does not yet have it in stock, you may want to check the "Dealer Locator" at http://www.federalpremium.com/default.aspx
That should tell you who sells their shells in your area.
They've been rather hard to find but should be more available now.
P.S. In the event that you can't find the "hard" shot, you may want to try some of their #6 lead. It's the best that I've found. You can see some results of my tests at http://allaboutshooting.com/article_info.php?articles_id=281