I swear it is not as naughty as it sounds. Despite the unfortunate acronym, the Complete Entertainment Exchange company is a great place to buy, sell, and exchange all forms of computer hardware and software.
It is an international technology exchange company with stores across the UK, Ireland, the US, Spain, India, and Australia. The two shops I've had most dealings with are the London shops in Kingston and the newly opened one in Wimbledon.
You can buy, sell, or exchange anything from mobile phones, video games, DVDs, HD and Bluray, computers, CDs, and a whole host of other electronic devices such as cameras and digital photo frames.
Once you have decided what you want to sell, simply go to their website and type the name of your product into the search engine. It will then come up with a list of matches and quote how much they sell the game for in their stores, how much store credit an exchange will give you, or how much you will get in cash.
For example, I recently took a few Nintendo Wii games to their Wimbledon branch. Donkey Kong Country Returns sells at £18 and I got £9 in cash. If I had taken store credit I would have got £12, but I am generally not keen on doing this. If I find something in the shop that I want at the time then I will do an exchange, but otherwise I will take cash. The reason for this is because their store credit has a use by date of one week. I discovered this the hard way, when I first made an exchange in Kingston. I was never told that there was a time frame in which it had to be used by, but when I checked the receipt a few days later, I saw the deadline. I ended up buying something I didn't really want just so not to waste it. I think this is pretty cheeky on their part, but overall I am happy with their service as they give fair prices.
If you do want to sell rather than exchange, on the first occasion you will need proof of ID. After that they will provide you with a fob card, which you can use for all future purchases. My one word of warning would be not to go there if you are in a hurry or there is a long queue. When you sell/exchange an item, it can take a long time. First the employee has to bring up all the products on the computer to find the prices, then he s/he has to check all your discs/equipment to make sure they are in good condition, and then they have to put them in sleeves and categorise them behind the desk. If everyone is doing this, then you could be waiting a while to get served.
CeX is a good place to go if you want to get a discount on the latest technology. They sell Kindles from £68, iPads from £245, and a Samsung Blu-ray player for £42.
There are other shops like Game and HMV that do exchanges but do not accept such a broad range, nor do they provide details on how much you will get for your products until you are there in the store. I like that CeX gives you all the details on their website, so you can make an informed decision beforehand.