I have the L3550CDW
Toners for your model on ebay very cheap
https://www.ebay.co.uk/itm/123922383...6hdjUluvyEdA23
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Drums on ebay
https://www.ebay.co.uk/itm/224601503...r=524317364777
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set of drums and toners
https://www.ebay.co.uk/itm/224601503...r=524317364778
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you should not have to change the drum very often same as the toner . If it in low it might be worth changing both or wait for it to tell you what you need
Brothers are always the way to go even the newest models tend to have 3rd party consumables by the time you run out of what it ships with