For U.K. FP fanatics the Tesco "Ink Cartridge Pen" is a very reasonable option at £2. I used these when I was younger before I bought my LAMYs. I would thoroughly recommend
Tesco Ink Cartridges For Epson T0715 Black Cyan Magenta Yellow Multipack BN&S | eBay
Tesco H90 - HP56, HP 56 Black - Genuine Ink Cartridges - Twin pack - Sealed on eBid United Kingdom | 205098156
TRF | Tesco Clubcard
TESCO E252, COLOUR Ink Cartridge Pack For Printers Using Epson T0612 T0613 T0614 £0.99 - PicClick UK
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