Meow Star via Amazon offers the Replacement Toothbrush Heads for Philips Sonicare 8-Pack in several colors (White pictured) for $16.99. Coupon code "MHXDMF5M" cuts it to $6.80. With free shipping for Prime members, that's $2 under our November mention, $10 off, and the best deal we've seen. These heads snap-on for easy installation.

Note: Several colors drop to $6.79 via the coupon code above.