If you have been looking for a portable computing device to take with you when you travel, or really anytime you are out of the office, you could do a lot worse than a Chromebook. Sure, it won't run Windows applications, but there are Chrome or Web apps to do 90% plus of what you can do on a Windows machine. And Chromebooks are the most secure and virus/malware-free portable device you can use (yes, more secure than a Mac). Currently, Best Buy has the aging but still very capable Acer C720 Chromebook on sale at an all-time low price of $129.
My wife and I each have a C720 (although mine is the higher-end touch screen model). We've found that the Celeron-powered Chromebooks like the C720 perform very well so long as you don't have more than a dozen or so browser tabs open. My wife uses her C720 as her main computer for all purposes. Mine is primary for "on the road" use. This sale at Best Buy is a terrific deal on a capable road or home computing companion.
You could buy four of these or one base model iPad Air.