As you'll know, buying OEM cartridges for your ink jet printer (or any consumables for most printers) is very expensive.
I have used UKDVDR's compatible cartridges for my Epson R300 for a couple of years now, and have never had a problem.
The cartridges come pre-chipped, so should be recognised as "OEM" by your printer.
A FULL SET of 6 cartridges is being sold for £3.99 + P&P.
A full set of EPSON cartridges would set you back (at £9.99 per cartridge on the same site) nearly £60!!!
Outrageous I hear you say..........!!!