HP 950XL Ink & HP 951 Ink XL Single or Combo Pack from $6.95
Amazon.com: HP 951XL Magenta High-yield Ink Cartridge | Works with HP OfficeJet 8600, HP OfficeJet Pro 251dw, 276dw, 8100, 8610, 8620, 8630 Series | Eligible for Instant Ink | CN047AN : Office Products