Avermedia AVerMedia Live Gamer Portable 2 Plus, 4K Pass-Through, 4K Full HD 1080p60 USB Game Capture device $125 at Amazon
I had this is my cart and noticed the price drop. Please note the 4k is pass-through and not capture. It captures at 1080p60. The nice thing about this device is that it can be used without a PC and it can write directly to a microSD card. Other than that it does all of the usual capture and streaming stuff as expected.