B&H Photo-Video offers the Hitachi 4TB Touro Desk USB 3.0 3.5" External Hard Drive
, model no. 0S03503, for $189
with free shipping
($0.05/GB). Outside of the price below, that's the lowest total price we could find by $50 and a very low price for a 4TB USB 3.0 external hard drive. It runs at 7200 rpm and features a 64MB cache. Deal ends November 28.
A close price: J&R offers it for a buck more with free shipping, via coupon code "TURKEY10".
Update: A similar 4TB Touro, model no. 0S03396, costs $169.99 with free shipping at Amazon as a Lightning Deal. It ends at 1 pm ET or when 100% claimed.