Amazon has the 4-Pack Philips Sonicare Premium White Replacement Toothbrush Heads (White, HX9064/65) on sale for $25 - 5% off with Subscribe & Save (can cancel anytime) = $24 with free shipping on $25+ or with Prime. Roughly $5.93 per brush head.

• Same Deal on the 4-Pack Gum Care (HX9054/65)