The new Tab 7 Essential and Tab 7 tablets by Lenovo come with quad-core MediaTek processors, they both run Android 7.0 Nougat out of the box, and they use a 7-inch IPS display. These slates can be acquired in the US for less than US$100.
https://www.notebookcheck.net/Lenovo-Tab-7-and-Tab-7-Essential-arrive-in-the-US.264062.0.html