Lenovo offers its Lenovo BT820-US Bluetooth Speaker, model no. 0B54211, for $29.99. Coupon code "BFRIDAYBT11" cuts it to $17.99. With free shipping, that's $12 under our mention from two weeks ago and the lowest total price we could find by $31. This 2-channel unit features two speakers and a 3.5mm jack; it can be powered by the included AC-DC adapter or four AA batteries (not included). Deal ends December 7.