Harman Kardon Invoke Smart Bluetooth Voice-Activated Speaker w/ Cortana (Graphite or Silver Pearl) $49.99 + Free Shipping By admin | September 20, 2018 1:41 am EST 0 Comment Best BuyFree Shipping or Free Store Pickup Harman Kardon Invoke Smart Bluetooth Voice-Activated Speaker w/ Cortana (Graphite or Silver Pearl ) $49.99 Currently $99.95 at Microsoft and $108.88 at Walmart