I have an Epson XP-247 which uses the same ink cartridges.
I recently purchased these from an ebay seller – all but the spare black is in the printer and working fine.
https://www.ebay.co.uk/itm/5-Ink-Cartridges-for-Epson-XP-245-XP-247-XP-342-XP-345-XP-442-XP-332-Non-OEM/282761773659?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649
Which works out at less than £1.20 per cartridge including p&p.
I have my own Word print test document which consists of 4 small text boxes, with each of the boarders and backgrounds coloured Black, Magenta, Cyan and Yellow.
If I notice a colour aberration in the print out – I print off the test Word document to determine which of the cartridges is at fault.
If a print cartridge is not printing soon after installation, remove it and check that the outlet seal has been pierced by the printer – and check that you have remembered to remove the cartridge strip allowing air into the cartridge as the ink is used.