Logitech G51 Surround Sound 5.1 Speaker System for $100.25 after a $40 rebate. Shipping is $19.74 so the total comes to $119.99 shipped. Here is a screenshot before the $40 rebate for your reference. It has received many positive user reviews. The package includes 4 satellite speakers, 1 center channel, 1 subwoofer, and a control pod. Its audio cables are also color-coded for convenience. This 5.1 speaker system usually goes for over $170.
Originally posted earlier, this deal has been revised.