Just a quick note, popped to my local sainsburys last night to get a couple of bits, at the end of the stationary isle there was a basket full of different printer inks.
They had the full pack of genuine epson r300 inks for £15. (T0487 multipack)
These inks normally cost me £60 from staples. They had quiet a lot and I only brought 1 pack, may go back this evening and get more.
Just letting you know because R300 owners will know how expensive these inks are.