Expreview has spotted GeForce 8800 GS graphics cards. The site says NVIDIA will soon introduce 384MB and 768MB GDDR3 GeForce 8800 GS graphics cards, these cards are based on the G92-150 core and feature 112 stream processors and a 192-bit memory bus.
The 384MB version has a 575MHz core, 1700MHz memory and 1438MHz shaders. The 768MB version has a 650MHz core, 1900MHz memory and 1625MHz shaders. For comparison: the GeForce 8800 GT has a 600MHz core, 1800MHz memory and 1500MHz shaders but has the advantage of a 256-bit memory bus.
More details and lots of pictures over here. The GeForce 8800 GS 384MB will retail for about $164 and the GeForce 8800 GS 768MB for roughly $204.