The Redmond giant, Microsoft, released its much-touted Surface Pro on Saturday and within a just seven hours of hitting the shelves, the 128GB variant of the tablet has sold out online.

The Windows 8-powered Surface Pro went on sale in the U.S. on Saturday, Feb. 9 and the 128GB version, priced at $999, is now out of stock at Microsoft's online store in the U.S.

"The Surface Pro Windows 8 tablet went on sale yesterday, and despite the rather negative reviews has been snapped up by fans, with the 128 GB version of the tablet selling out in a mere 7 hours at microsoft' online store," reported Microsoft News.

Microsoft acknowledged the overwhelming response and said that it was looking to restock "as quickly as possible,"

"Customer response to the launch of Surface Pro has been amazing. We're working with our retail partners who are currently out of stock of the 128GB Surface Pro to replenish supplies as quickly as possible. Our priority is to ensure that every customer gets their new Surface Pro as soon as possible," noted Microsoft in an official Surface blog post.

Per reports, Microsoft planned on having only one million unites of the Surface Pro for initial shipment. By contrast, the Surface RT had an initial shipment volume of four million units. This could possibly be one of the reasons for the tablet being sold out so quickly.

At the time of writing, the 64GB of the Surface Pro was available for purchase at Microsoft's online store. The 64GB version costs $899, and judging by the response for the 128GB variant, we could soon see the former getting sold out too.

Apart from Microsoft retail and online stores, both Best Buy and Staples are retailing the Surface Pro in the U.S. The 128GB version of the Surface Pro shows "not available for shipping" at Best Buy's online store, suggesting that the retailer may have sold out its stock as well. The 64GB version of the 10.6-inch tablet, however, is available for shipping.

Additionally, Staples' online store shows that the 128GB Surface pro is currently "out of stock," whereas the 64GB version is available only in store.

If you're hankering for a Surface Pro, it seems you'll have to wait till Microsoft replenishes the stock, which will hopefully be soon. Alternately, you can try the Microsoft Canada online store, which at the time of writing had the 128GB Surface Pro in stock.