UPDATE: Best Buy has changed their site a tiny bit. Now, when you follow the link above, you get to a page where they show the iPads, but then you have to click on a link to check availability for that particular unit. Of course, they don’t have any iPad 2s, in any flavor, when I check, but who knows, you might get lucky. Here’s a picture of what you’re looking for. Bonus: click anywhere on the picture to see Best Buy’s complete selection of iPad 2s. From there, click those “Check Shipping & Availability” links.
UPDATE 2: Target also sells the iPad 2, but it appears that Best Buy is a better bet. I went to a big Target in Los Angeles and they told me they’d received FIVE iPad 2 units– not even one of each Wi-Fi flavor– on launch day, and nothing since. They have no idea when they’ll get more.
UPDATE 3: Best Buy has them now (March 23rd, 2011). Use the Best Buy iPad 2 Availability Checker (thanks, www.obamapacman.com).