Funny, I've had a tuner for a few years now:
There's a small difference between "exists" and "available" for purchase. Affordability also comes into this. Mwave are selling Leadtek WinFast PxPVR2200 PCI-E for $AU1,309.98 for example. That's rather more than a Philips 40" UHD monitor costs (~$AU1,000)! In the event, the device I purchased (Hauppauge MINISTICKUSB) cost $AU64.38. Fingers crossed...