Here’s an easy freebie at Walgreens. Members can get Colgate Keep toothbrush head refills on sale this week for $4.99. Clip the $5/1 Colgate Keep whitening two-pack coupon in the store app, bringing your total down to free. Note that the coupon will adjust to $4.99 as Walgreens does not pay overages per the Walgreens Coupon Policy. This deal can be accessed both in stores and online for store pickup.