On the subject of used games, while personal trading is more than fair enough (it's the bedrock of humanity, really), the used game industry is an abhorrent practice that continues to get worse and worse for all involved.
Users trading games in get paid a pittance of what the game is worth, both new and to the shop then selling it on. They'll pay you £10 or so at most for a game not a month old, and sell it at less than a fiver less than the price of a new game, making a £20-£30 markup on it and keeping all that money for themselves. Not for you, the person who owns the goods
they want and thus should be in the position of power, not for the developers or the publishers, who will
never see a penny of that game sold on again. That may not seem like a problem for the occasional sale, but we
all know that these shops will push the used game over the new game every single time. It's not 'cos the consumer can save a fiver or a tenner on the price of the game they want, it's 'cos
they make an extra 200%+ profit on that sale, and to hang with everyone else in the process.
If you want to buy used games, buy them from friends, in second hand shops (where the money, at least, goes to charity), from market traders (though don't buy the pirate ones
, for your own sake if nothing else) or on sites like eBay. This is what the grey market for second hand goods is
meant to be, not just some way for retailers to screw over everyone involved in the games industry - including their own customers - in pure greed.
Rant aside, I've made my fair share of second hand hauls. Most of my retro gaming consoles (my SNES, N64, another Playstation and another Mega Drive) I've picked up from working in a charity shop. We weren't actually allowed to sell electronic goods (because firstly, we can't cover the warranty, and secondly 'cos it could be dangerous if they're faulty), so instead of binning them, I took them and left a totally unrelated donation. I also managed to pick up a number of games each for them - though my SNES collection is still just Street Fighter and a football game.
I also, yeaaars ago, but still during the Mega Drive's prime, managed to use my primary school's annual May Fair (and a few other car boot sales) to pick up the vast majority of my treasured Master System collection. Back then, it was nigh on impossible to find these games -second hand OR new. The Master System was technically still supported by Sega - but the shops sure as hell didn't. Aside from most of the games I got as a kid in the first couple of years of its life, the majority of my Master System games were picked up by hunting every car boot sale we could find for people practically giving them away. The Master System never set the world alight like its competitor, and mine has always been as broken as hell, but I still love the little bastard.