I had come back and was just checking online and I hadn't logged on to costco web site but I did put it in the cart. Still at that point it wasn't showing the price. So I went up to cart and it showed the 499.99 with the 50 discount=449.99?
I don't know were the 50 that posted came from. But it is the same as the instant 50 off in store.
See the screen shot/attachment.
Pretty sure in my store its 429.