Justforyou*11 via eBay offers two Philips Sonicare HX6013 ProResults Standard Tooth Brush Head 3-Packs for $16.75 with free shipping. That's a buck under our mention from two weeks ago and the lowest per-unit price we've seen. (It's also a current low for this quantity by $5.) They feature a snap-on design and contoured bristles.