GearXS offers the Wellness Oral Care Rechargeable Electric Water Flosser
, model no. WE4200, for $39.99. Coupon code "10OFF" cuts it to $29.99
. With free shipping
, that's the lowest total price we could find by $5. It features an adjustable water pressure from 40 psi to 80 psi, fold-down nozzle tips, and up to four weeks of use on a single charge.