National Geographic is running a photography competition with DJI, and as part of that competition, you may be able to rent a DJI MAVIC PRO for FREE for two weeks (14 days) from your local DJI Store.
You have to sign-up for this promotion. Selection is done randomly per the page, not based on photographic or drone piloting qualifications. There is no guarantee you will be selected. Details on the promotional page over there.
Promotion expires 10/31/17.