How do I order genuine replacement parts and supplies?
You can find instructions to purchase through HP's online store or authorized distribution partners under 'Ordering' guidance (Table 3-2 on page 35). HP SureSupply website www.hp.com/go/suresupply provides links directly for part numbers and quantities available.
From the official HP Laserjet Pro Mfp M428 M429 manual, page 34
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