DVD burner questions

OK, I am thinking of buying one. But first...

- I'd have the ability to basically make copies of DVDs, right? Because I work at a video store, and you know... I'd never have to buy a DVD again.

- How much do they go for?

- Is there any free software to copy DVDs or waht? What is the process? Like how long does it take and shit.

HOOK ME UP.