Find any tablet with MTK SoC there are MT6582(phones) equivalent tablet MTK8382and most other MTK devices there are lots of support forums for MTK SoC from Russia to Asia and US. One key root 99% sure to root MTK are iRoot, Kinguser/Kingoroot(PC/Android version). I specialised in MTK modding over 5 years and I can say if you chose the right brand/model it will be fun after rooting.
If you want to root tablet with easy way, you'd better choose a root tool with good reputation. iRoot can help you complete this task. Follow these steps:
Step 1: Download and Install iRoot apk file.
Step 2: Make sure you have backed up your data before. Open iRoot and click the “Get Root access”on the interface.
Step 3: Now your device is on the rooting process now. Just wait for its success.
Step 4: Congratulations! You have rooted successfully.
Or you can check this page: Root Any Android Tablet