Sigma 10-20mm F3.5 EX DC HSM (Nikon) - Walmart.com
Sigma 10-20mm f/3.5 EX DC HSM Lens Review
Amazon.com : Sigma 10-20mm f/3.5 EX DC HSM ELD SLD Aspherical Super Wide Angle Lens for Nikon Digital SLR Cameras : Digital Slr Camera Lenses : Electronics
B&H and Adorama now taking pre-orders for the new Nikkor lenses *UPDATED* - Nikon Rumors