Where can i buy HP Ink cartridges for my photo printer?

I have been buying Hewlett Packard colour and black ink cartridges for my photo printer but from a well known Camera shop but they are so expensive, are there any shops in London, UK that i could go to, because i can't afford what these shops charge. Also i need photo paper too. I have looked on line but... show more I have been buying Hewlett Packard colour and black ink cartridges for my photo printer but from a well known Camera shop but they are so expensive, are there any shops in London, UK that i could go to, because i can't afford what these shops charge. Also i need photo paper too. I have looked on line but can't seem to find what i am after, unless anyone can help on that too, i would be grateful for any help.
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