The Sony E-mount system has matured over the past few years and Sony has chosen to retire the NEX branding and consolidate all of its interchangeable lens cameras under the Alpha brand name with a designation only of whether they are A-mount or E-mount cameras.
The A-mount cameras are more traditional DSLR cameras, currently comprised of cameras using Sony translucent mirror technology. The E-mount cameras are mirrorless cameras and are a generally more compact design.
B&H has the Sony NEX-3N w/ 16-50mm power zoom lens for $298 (was $499) with free shipping and 2% rewards. Check it out here at B&H Photo.