well i wouldnt recomend cartridge world blackburn i used them once and the ink came back not working and got into a right old argument with them because not only was it not working it also wasnt the cartridge i left with them and the head was knackered on the one they gave me and i never did get a refund as it would just add more cost traveling to blackburn,also i have heard from others that they dont fill them much anyway
look for compatables i know you can get compatables for any epson printer but im not sure on other brands
some refurbished ones slightly cheaper on this site , you will probably find slightly cheaper if you look elswhere as i just clicked teh first page of google
http://www.365ink.co.uk/dell-dell-c-607_1821_1822.html