A large number of readers here at Amazon and many are substantially cheaper than the P5100.
I have a Inspiron 3880 Desktop. I'm VERY happy with it except for one thing. I am tired of having to sign in for EVERYTHING. I do have Roboform. But all my passwords are long and strong. I. also, have a Inspiron 7590 2-in-1 laptop. The thing I LOVE about it is being able to sign in using my FINGERPRINT. It works GREAT. Have incorporated Roboform using my fingerprint with it. My question: is it possible to use an external fingerprint reader with the 3880 desktop like the Verifi P5100? (works through Windows Hello I believe) It would have been nice if Dell would have incorporated a fingerprint reader into the 3880. Appreciate your responses. Getting through to technical support is near impossible today.....thanks. 
Inspiron 3880 Desktop, External Fingerprint Reader?