If you’re in the market for an iPhone, you might want to check out Best Buy on Monday.

Best Buy and Best Buy Mobile specialty stores are offering users the opportunity to pick up an AT&T 8GB iPhone 3GS for free. The offer is available to those who wish to upgrade or purchase a new two-year activation.

Of course, the iPhone 3GS is not the newest iPhone on the market, but it’s still a worthy phone. The sale is for Monday, August 22 only.

The deal is for in-store only sales, according to Best Buy.