Replacement Inks - Epson Stylus Photo 2100

Can anyone help,

I’ve the Epson A3 Stylus Photo 2100 and am looking to buy “replacement” cartridges here in the UK. The print quality, both paper and DVD, is second to none, just costs the earth.

I’m having a hell of a job finding Epson cartridges locally - let alone replacement ones. I’m using nearly two cartridges a week, and at £13+ each it’s getting a little expensive.

Anyone have a web address - here in the UK - with reasonably priced replacements?