B&H now has the Vello battery grip for the Canon 6D available and shipping for only $75. Compare that to $229 for the official Canon BG-E13 battery grip for the 6D.
I hadpreviously tested the Vello grips for the Canon 5D Mark II and 7D, and found them to be solid performers – especially considering the price. Check out the Vello grip for the Canon 6D here at B&H Photo.