Sorry if this has been answered elsewhere but I did search this forum and the net and couldn't find the answer, soooo... does the Surface Pro 3 type cover work with a Pro 4? I ask as for me $100/£100+ is just too expensive for a keyboard, especially as I've recently seen some heavily reduced Pro 3 covers (e.g £29, PCWorld in UK) but when I ask the staff, they have no idea and will not even bother to find out by using a demo machine. *rant on* No doubt they would be sooo helpful if it were an Apple product *rant off*. So any reply, especially from anyone who as actually plugged a Pro3 type cover into a Pro4, would be greatly appreciated. Also, if anyone has any links from these forums or elsewhere to any well made, reliable third party type cover alternatives, please link away. Thanks in advance.