Amazon offers Prime members the Chamberlain Universal Laser Garage Parking Assist, model no. CLULP1, for $16.31 with free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $6.60.) That's tied with last week's mention and the lowest price we could find by a buck. It features plug-in installation, class 2 laser, anchor, screw, two wire nuts, power adapter, and instructions.
Update: It's now on backorder.