Ending today, Groupon offers the Reach Barrier Do It Yourself Garage Door Insulation Kit, model no. 3009, for $34.99. Coupon code "GOOD10" cuts it to $31.49. With free shipping, that's tied with our mention from two weeks ago as the lowest total price we've seen. (It's a current low by $18.) It covers an 8x8-foot garage door and purports to insulate and reduce noise.