Okay getting serious now You need the proper hardware for that so you'd have to pay a lot of money to find a new computer with that. It's the windows hello feature which needs a special camera to function. BTW: if you want alternative to face unlock Check out keylemon.com They have face unlock but not as good as windows hello
Even as good as that it has to have the special camera for the face recognition to work They don't sell them separately Only on new machines
Some new laptops have the proper camera built in, but if you're looking for a desktop thing, you have to buy one of those trio cameras that is supported for this.