I've looked on websites like Ebay and Amazon but was just wondering if there were any cheaper options around. Websites must be trustworthy - if you've had firsthand experience with them please let me know!

I have a Curve at the moment but really want a Bold, so trying to find the cheapest option as I can't really justify spending £250 on a phone that I basically already have, lol.

Phone must be sim-free as I'm already on a contract and will just switch my sim over.

Thanks!
I like in the UK so can't go into American stores etc..
Electronic goods are usually cheaper on the internet which is why I'm asking for websites.