REI has their labor day sale going on.
Including this Yakima Cargo Roof Box I have been waiting for a deal on.
Yakima SkyBox 16 Carbonite Cargo Roof Box $447.19 [rei.com]
Also you can get their membership card for $20, and a free $20 gift card - you can't use the gift card on this purchase though.
With the REI membership, you'll get 10% back on this purchase - you won't get the 10% back until March 2020 though. (But if you subtract the 10%: $447.19-$44.72=$402.47) - Decent Deal
You have to select store pickup as well, shipping is outrageous.