The price of the rental package doesn't mean anything in terms of value, unless you consider the price it has cost you to watch each DVD / Video per month. This means you need to know how many DVD / Video's you can realistically watch in any given month.
So, how many DVD / Video's can you receive in a month? Well, it depends upon a number of things including (i) how quickly you watch the DVD / Video after receiving it, (ii) how quickly you get it back into the return post, (iii) how quickly the postal service gets it back to the online provider, (iv) how quickly the online provider registers its return and allocates your next selected DVD / Video, and (v) how quickly the postal service delivers it to you.