Exclusive to Prime members, ends 9/30. Amazon has the $200 Echo Studio High-Fidelity Smart Speaker bundled with the $130 Echo Sub as a discounted price of $247.49 with free shipping. 

Echo Studio has a 1.0" tweeter, three 2.0" mid-range speakers, and a 5.3" woofer; Dolby Atmos enabled. Echo Sub has a 100W, 6" woofer. Both speakers can be paired with other Echo devices.