Amazon offers Prime members the Black + Decker 1/4-Sheet Orbital Sander, model no. BDEQS300, for $16.15 with free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $7.39.) That's tied with last week's mention and the lowest total price we could find by $18. It delivers up to 1,600 orbits per minute and features tri-layer filtration and a soft grip paddle switch.
Orders placed via Prime by December 22 are expected to arrive by Christmas.