Sales of Apple’s iPad multimedia tablet topped the 3 million mark in 80 days despite ongoing issues with keeping enough in stock for customers.

“We’re working hard to get this magical product into the hands of even more people around the world, including those in nine more countries next month,” commented Apple CEO Steve Jobs.

It took 28 days for Apple to sell a million iPads, and that was before the model with 3G wireless data support was available.

The tablet devices includes a 9.7-inch multi-touch display, runs iPhone OS, supports most iPhone apps, includes its own ebook reader app, includes built-in Wi-Fi and Bluetooth connectivity, and some models are available with 3G wireless data access, too.

Apple introduced the Wi-Fi version of the iPad on April 3 to long lines of customers in the U.S. The company rolled out the model with Wi-Fi and 3G about a month later.

The company has since expanded iPad sales into several other countries, and is ready to move its multimedia tablet device into even more countries in the coming weeks.