As one of its daily deals, Groupon offers the Pursonic S450 Deluxe Sonic Toothbrush for $39.99. Coupon code "HEALTH20" cuts it to $31.99. With free shipping, that's $16 below our March mention and the lowest total price we've seen. (It's a current low by $18.) It brushes at 30,000 strokes per minute and includes 12 extra brush-heads and UV sanitizing chamber. Deal ends today.