dvd burner 13' macbook.

i'm pretty sure my default 13' white macbook doesn't come with dvd burner.
so, i want to get one.
i'm sort of confused.
are all dvd burners the same in the hardware sense and just install different softwares for Mac or Windows?
i mostly need a dvd burner to copy some movies for my trip and backup my computer.
also, any suggestions? not too pricy.
thanks..

...why nobody replies...
i so need help.