Philips Sonicare E-Series Replacement Brush Heads (2-Pack) for $18.67 shipped after selecting Subscribe & Save to get an extra 15% off. The subscription can be canceled at any time with a few clicks after your order ships. Here is a screenshot for your reference. It is compatible with Sonicare Advance, Elite & Essence Series handles. Most places have it for about $24 or more.
This deal has expired as it is now out of stock. Congratulations to those able to get in on it.