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Get an 8-Pack of Philips Sonicare-Compatible Replacement Toothbrush Heads for $10.99 with $2.99 shipping at Groupon Goods. This is the best price we could find for an 8-pack of generic replacement brush heads by $15. They're compatible with Diamond Clean, FlexCare, FlexCare+, Healthy White, and Easy Clean models. Sales tax is charged in most states.