Target is currently running a promo where if you buy a Google Home you get $35, or the price of the product (whichever is lower,) back. With the current Chomecast Audio or Video pricing this means a free audio or video device, or $35 off of the Chromecast Ultra which is currently listed at $69.

Target Google Promo

The deal works on, place a Google Home in your cart, then place a related Google product, a $35 discount appears, or $30 if your product is only $30.

Pretty sweet deal.