About the price, Underworks has the cheaper binders, but if you'd want one from Les Love Boat then you'd have to pay about twice as much.
But yea, mostly what Morgan said. It's a good thing to take 'm off when you're home. (yes, even if you don't want to) because your body needs the rest. Don't wear two binders on top of eachother and don't take a size too small. If you're in between two sizes, go for the bigger one (especially for your first binder, but still, smaller one could really be too small).
I, for one, have noticed my back is aching more often, it's not that bad, but it's definately from binding. Stress causes my back to ache as well, but that's a lot worse and in different areas.
Oh, and I am one of the lucky, smaller chested, guys though. But my boyfriend isn't, so besides binding, he layers his shirts (loose fitting tanktop under a t-shirt works wonders) and wears a lot of blouses when he's at school.