Chuck, making money is easy, its called arbitraging. You look for price descepencies and then expliot them. Simple example www.amazon.co.uk sell LOTR box set at £40, www.play.com sell if for £25. Therefore you go onto amazon.co.uk and list your brand new copy at a discount price of... say... £33. When someone buys it you then go onto play.com and buy is for 25 but put their address as the delivery. Thus you made 8 quid for nothing.
Thats a made up example, but I used to do if all the time with those two sites, play is cheap but not well known, amazon is big so people jus pay more for the name.
I do this with guitars too.