Western Digital offers its Western Digital My Book AV 1TB Dish Network DVR Expander USB Hard Drive, model no. WDBABU0010HBK-NESN, for $84.99. Coupon code "SHIPFREE2ME" bags free shipping. That's the lowest total price we could find by $96. This external storage device that works with your USB-capable Dish Network DVR to expand your storage capacity.