Of limited interest to anyone outside the UK but Morrisons Supermarkets (online at least) are selling 25 cartridges for 10 pence, sorry I don't know the maker but I cannot resist a bargain, even though I may give them away.
https://groceries.morrisons.com/prod...ills-509639011
edit 21/9/2021
Cartridges are Diamine majestic blue and are excellent. This compares to the Diamine list price of over £5 for 18 cartridges.
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