Depends what you want. If you want original obviously more pricier but you can get cheaper compatible brands that do the same job. I tend to use Icon on Sheffield Road or order online.
place i used to go to in wakey has closed, i go to the 1 outside the ridings now. usually adverts in the paper about cheap cartridges by mail. so will be interested in the replies you get hemmsy.
Not tried it myself but... A guy who used to come in the pub where I work looks for the cheapest compatible ink online and buys that, aparently he's never dropped on a dud one yet. He was telling me about one he bough for £7 and if he'd have got a top branded one, it'd have been £28.
Re: Not tried it myself but... Best I've ever come across is Inkredible I use them in my canon,the first time you buy them they are fitted with a removable chip and after that you just swap the chip on to the new cartridge,they were so cheap I was dubious but after using several packs full now I've only had 2 failures,they're often having bogof deals that work out at less than £1 per cartridge.
www.prink.co.uk have been great for me. £7.99 for four cartridges for my Epson Stylus SX and they last ages. That price includes postage too