(re: Where to find Gabriel Knight?)
http://www.gametz.com is an awesome game trading website. Unfortunately they recently made people pay to use it but it’s well worth it if you’re a big gamer (especially if you’re looking for old games!). You can still search for games if you don’t subscribe. If you don’t have any games to trade, you can buy them or sell or your old games too. That’s where I got most of my Sierra game colleciton.