Microsoft's 802.11n adapter for the Xbox 360 has surfaced in Costco's online store for a slightly discounted price of $88. The accessory previously popped up in GameStop's inventory slated for November 3rd, although the listing was later removed. Costco claims the adapter is scheduled for shipment a week later on November 10th.

The 802.11n device provides two antennas for improved signal quality and transfer speeds. Wireless N speeds should allow users to stream 1080p content from the revamped Zune movies collection. [via Engadget]