You will once again be able to purchase a Samsung Galaxy Tab 10.1 in the United States of America now that the sales ban instituted at the start of the Apple v Samsung trial has been lifted. It's lifting follows a finding by the jury, who awarded Apple $1+ billion in damages, that the tablet didn't infringe on a single Apple patent.
Samsung will also be receiving a $2.6 million bond that was placed in case the injunction was determined to be unfair. Samsung will likely seek damages for lost sales from Apple as the sales ban was unfairly sought and imposed. Whether or not they will receive anything is a different matter.
The Galaxy Tab 10.1 isn't out of the woods yet, though. Apple has filed a "rule 50 motion" looking to overturn the jury's' decision in December. If this motion is successful, then the tablet will see a permanent sales ban in the United States. If you're looking to obtain a Galaxy Tab 10.1, you should buy it before December, just in case Apple succeeds.