Pecham US via Amazon offers its Pecham 3-Mode Water Flosser in Blue or Black for $29.99. Coupon code "5AUBPG54" drops it to $27.19. With free shipping, that's tied with our August mention and the lowest price we could find by $12. It features three operating modes, a 360° nozzle, and four jet tips.

Update: The price now drops to $20.99.