Dell has the Buffalo LinkStation Duo 4TB External Network Attached Storage Hard Drive, model no. LS-WV4.0TL/R1, for $349.99 (399.99 – 50 coupon) with Free Shipping for limited time. To get discount, use the coupon code: K$$V3WNT4?Z6VX at checkout. Coupon expires June 14, 2012, 10 am EST.

The LinkStation Pro Duo NAS hard drive array offers instant storage expansion and file access on your home or home office network and over the Internet. The LS-WVL/R1 features a high-speed 1.6 GHz processor for maximum transfer speed of up to 72 MBps. Plug it into any network Ethernet port or into the back of your wireless router and access it on any networked computer in your house. While on the go, use Buffalo’s WebAccess service for remote access to your files over the Internet from any standard Web browser or download the WebAccess i apps from the the App Store to access and share files from your iPhone®, iPod touch® and iPad®. Additionally, the Included NovaBACKUP Professional software for Windows and Time Machine support provides a whole home backup solution for every PC and Mac on your network. With all these and more features the LinkStation Pro Duo makes central storage and backup easy.