In Europe, they also sell the 3GS limited to 8GB storage. In its heyday, the 3GS was only sold in 16 and 32 GB versions. Note that all the software for the iPhone 4 (except for a few apps that require front-cam, flashlight or gyroscope) also runs on the 3GS. Seems to me the older 3G has been left behind for over an year now.