I would think that you will be very lucky if you can purchase genuine Epson inks cheaply. I did have at one time an Epson printer but never bought the genuine inks for it. I ignored the thought that re-manufactured cartridges would clog the machine with ink and they never did. There are lots of firms on the Internet which possible could supply you with compatible cartridges at a fraction of the price for the genuine article....I can't suggest a name because of infringing AB's rules which forbid advertising in it's correspondence columns, but it is possible to purchase suitable items at a quarter of full price.
I got a cartridge from Asda's own that fit my printer much cheaper too. Also the Cartridge Shop offered to look at one of my cartridges as it had dried up, it had hardly been used. I also bought a black cartridge from them which was a darn sight cheaper than the bona fide one.