[Halcyon]

I bought a Cd for £2.50 and sold it for £34 about 2 years ago.
I was well happy.
Its just a matter of searching around and you need to have time to look for the right items that sell.

As for bidding, check out the sellers feedback. Good feedback from custommors is a good way of knowing that you are dealing with a reliable buyer.
Oh and make sure you check out postage costs. Most of the time they are listed, however you can ask sellers a question anytime.