The high-speed mobile version of Apple Inc's iPad will hit store shelves on April 30, and international pricing for the tablet computer will be spelled out on May 10, the company said on Tuesday.

The popular touchscreen device has sold more than 500,000 units of its Wi-Fi model in the U.S. in the week after its April 3 launch. Demand is expected to remain high with the launch of the version that connects to AT&T's third generation -- or 3G -- wireless network.

The 3G model, which also operates via Wi-Fi, will cost an additional $130, meaning that the 16GB, 32GB and 64GB models will cost $629, $729 and $829, respectively.

Apple said the iPad -- a flat device with a color touchscreen whose uses include surfing the Web, watching movies, playing games and sending email -- will be available at the end of May in Australia, Canada, France, Germany, Italy, Japan, Spain, Switzerland and the UK.

(Reporting by Franklin Paul; Editing by Derek Caney)