has the Samsung 50" Class (49.5" Diag) 4K Ultra HD LED LCD TV - model UN50KU630DFXZA for $570 for Costco members only (must be logged in to see discount).
Member Only Item
Online Price $719.99
Your Price $569.99
$150 OFF & Free Shipping
$150 manufacturer's discount is valid 9/18/16 through 9/24/16. While supplies last.
Alternately: it looks like Amazon [amazon.com]
has the same model (6300) for $597.99