Virtual reality is just getting started. A bunch of companies, including HTC, Samsung, and Sony have shown off headsets that immerse you in a virtual world, and Facebook's Oculus — credited with kickstarting the latest craze — has been selling a version to developers for some time now.

But most people have never tried or even seen a VR headset, much less been able to buy one.

That's going to change, fast. Business Insider Intelligence expects VR to be the next big thing in gaming, with 26.5 million units sold in 2020. That would give it a compound annual growth rate of nearly 100% — in other words, sales, on average, will double every year for the next five. So get ready to be immersed.