I already purchased an HP Mixed Reality Headset (develop edition). I would like to buy a pair of controllers for it now as they were not available when I bought the headset. I cannot find them as a stand-alone purchase anywhere on the Microsoft Store or HP store. Where can you buy them alone?
Edit:
Thanks to post below, link: http://www.dell.com/en-us/shop/accessories/apd/536-bbbs?c=us&l=en&s=dhs&cs=19&sku=536-BBBS