U.S. retailer Best Buy has started accepting pre-orders for Microsoft's Windows Phone 8-powered smartphones - Nokia's Lumia 920 and HTC 8X - from Sunday, Oct. 21.

The retailer will be offering the Lumia 920 and HTC 8X for $149.99 and $ 99.99, respectively.

"Best Buy has some very attractive pricing for the new Windows Phone 8 handsets that are about to hit the market. The retailer is now accepting orders for the HTC Windows Phone 8X and the Nokia Lumia 920, the flagship Windows Phone smartphones from both companies. The Lumia 920 will set you back just $150 with a new two-year AT&T contract while the Windows Phone 8X is just $99 with a contract," noted Web site Technobuffalo.

Earlier in October, The Verge had disclosed that the retailer would begin taking pre-orders on Oct. 21.

"Microsoft's first Windows Phone 8 devices will be available for pre-order in the US on October 21st. Sources familiar with AT&T and Microsoft's plans have revealed to The Verge that the carrier will start taking pre-orders for its range of Windows Phone 8 handsets on October 21st - including the HTC 8X and Nokia's Lumia 920," stated The Verge report.

Both the smartphones are available for pre-order on Best Buy immediately for carrier AT&T. However, Best Buy has not disclosed when the handsets will be dispatched and notes that it "will ship when available." Buyers have the option to purchase the 4.5-inch Lumia 920 in red, yellow, black, and white shells.

The Lumia 920 features a 4.5-inch AMOLED PureMotion HD+ display with 1280 x 768 pixels resolution at 332 ppi. It also packs in a 1.5GHz dual-core Snapdragon S4 processor with 1GB of RAM, which Qualcomm claims has "best in-class performance. The Lumia 920 has an 8.7-megapixel rear-facing camera and 1.2-megapixel front-facing one.

The HTC 8X sports a 4.3-inch HD display with 1280 x 720 pixels resolution at 342 ppi. It packs in a 1.5GHz Qualcomm Snapdragon S4 processor with 1GB of RAM. The smartphone has an 8-megapixel rear-facing camera and 2.1-megapixel front-facing snapper.

Microsoft is slated to hold a special event in October post which the smartphones are expected to hit the consumer market.

Update: It seems that Best Buy has removed the Lumia 920 from its site even though the HTC 8X is still listed.