Polk Audio PSW108 10″ Subwoofer, Black – $79.99 via Bestbuy through Google Express

Google Express via Best Buy has the Polk PSW108 for $99.99
With a Google Express coupon 20% off (max $20.00) – MARSAVE19 – Exp Mar 31, 2019 it comes out to $79.99 before tax.
Similarly Bestbuy and Bestbuy Ebay has it for $99.99.
I couldn’t get the coupon to work with a new Google Express account but I got lucky with a manager from Bestbuy and offered me open box for $50 dollars.