Sony Store offers its Sony Ultra Slim Cable Management System, model no. 27-PROFORMACM01, for $119.99. Coupon code "70OFFPROFORMA" cuts that to $49.99. With free shipping, that's the lowest total price we could find by $18. It features pre-installed HDMI and power extension cables. Deal ends November 30.
Of note, this item is temporarily out of stock, but can be ordered at this price for delivery when available.