No, this is not a DIY product, and yes you can actually buy one! The air Umbrella was a Kickstarter project that has been successfully funded and is scheduled to be up for sale in Dec 2015!

As you might have guessed from its name, the Air Umbrella uses a force field of air to keep you dry. One end of the umbrella contains a motor that generates enough airflow that ‘blows’ away rain, creating an invisible umbrella effect. This futuristic umbrella is expected to be priced around USD128 and USD148 each. Do check out the KickStarter page for more updated details.

Photo Sources: https://www.kickstarter.com/projects/1243275397/air-umbrella