If you still want both Streaming and DVD/BluRay mailed to you, then a little planning makes your cost only $7.99/month, thanks to Netflix letting you change your plan at the drop of a hat.

I mainly keep the DVD mailers for the shows that are not and will not ever be streamed in the near future, such as HBO original series like The Wire and Game of Thrones. I don't really need DVDs all of the time, though, so I plan to watch The Wire for a month and cancel my streaming plan, then I plan to watch streaming for a month and switch the plan back to DVD-only.

It's a little bit of a hassle, but it does save you $7.99/month.