Have a look at 7dayshop.com.
I use them regularly for Epson compatible cartridges and find them cheap, but with good quality.
I have a Epson SX100 printer, I get my inks from Internet Inks .com, I note thatWilkinsons own lable inks are good value epsom compatible R245 £12.00 for set
When I had my computer and printer three years ago now, my son in law who works in IT advised
me, to never use compatibles, just to Epson branded one, but they do vary in price quite a lot, Bernard. they say you cant teach old dogs new tricks, I was 79 then.
I think I paid about £80 for my printer, I used to getTesco but their prices haveI have never had a problem with compatibles for my Epson (and I work in IT).
If you have a fairly cheap printer then if you DO buy compatibles and the printer stops working after 2 years just buy a new printer.
The money you saved on the ink will easily cover the cost of the printer.
My printer cost me about £35 and a pack of 4 "official" Epson inks costs around £30 (even more in some places), almost the cost of a new printer.
I can buy a set of 4 compatible for around £7 (though usually buy decent ones from Tesco).