Amazon has the 16-Pack Aster Replacement Heads for Oral-B Braun Toothbrushes (Professional Care, Triumph, Advance Power, Vitality Precision Clean, Sensitive, White + Clean, & Dual Clean Series) on sale for $8.31 - 5% off with Subscribe & Save (can cancel anytime) = $7.89 with free shipping on $25+ or with Prime. Not compatible with Oral-B Pulsonic and iO.