Upscale movie replica store Anovos has made their First Order Stormtrooper line from Star Wars: The Force Awakens available for purchase. and I have to tell you it is not a cheap thing to buy it depends on how you want to receive your armor. The company will assemble it for you for about $6,000, If it is too expensive for you, you can order a kit and assemble it yourself for closer to $2,000.
You can purchase here. Keep in mind this is for pre-order and they will not be shipping until September!