The iPad 3G went on sale over the weekend and according to Gene Munster, analyst for Piper Jaffray, Apple may have already sold about 300,000 3G devices. An article on the All Things Digital website says that by Sunday afternoon, many Apple stores were sold out of the device. In addition, Apple’s website now lists a waiting time of five to seven days for new orders. Munster estimates that Apple has sold more than a million iPads to date (WiFi and 3G models).
To find out more about the models, Mashable.com has an interesting review that compares the 3G and WiFi versions.