Here in the Sunnyvale, CA area, I remember Atari products being sold at the world-famous Toys R Us in Sunnyvale (the one with the ghost), Sears in Mountain View, and I got a ton of 2600 carts at the Emporium basement sales on the Sunnyvale/Mountain View border. I'm sure there were other places, like the electronics stores and Montgomery Wards in the Sunnyvale Town Center, but those are the places I definitely remember seling Atari products.