Where to get a cheap iPhone 4S? - 1

I've finally decided to get an iPhone, seeing as the latest range has recently released I thought there would be a significant drop in price for the older models. I think the 4S suits my needs just fine. So where is the best place? New or Used, doesn't really matter.

If you have craigslist in the UK then I would check there first. Usually you can find better prices from an individual that is really just trying to get rid of something they no longer want vs.a retail store that may be trying to make a large profit on it's used iPhones.
Of course your usual classifieds in the papers or online would work as well.
You'll almost always get a better deal form a private seller than from a retail store because the store has overhead to pay for such as employees, rent, electric etc.
The trade off is that you could get a warranty from the store if something goes wrong with the phone after you buy it.