Limited number of iPad 2’s were available for sale at Select Best Buy stores and Toys r us Stores today and it is likely that 3G 64 GB versions are still available in many of the locations. When I checked the local Best Buy they still had few of the Verizon 64 GB versions available but none of the WiFi only versions.
Toys r us also started selling the second Gen iPad today , but not all the locations had it. Most likely that stores in Prominent locations and bigger size carry the device, but they also seem to carry only 3G versions and not the WiFi Only versions.