We recommend the 8” Alldocube at https://www.amazon.com/ALLDOCUBE-iPlay50-Widevine-Expandable-1920%C3%971200/dp/B0CBK85CBS/. It is $76 each in quantity 10, about the same price as a history textbook. The display is beautiful, and the device is fast. A school district could skip buying new editions of history textbooks for a year and use the money for tablets. We have been using it for almost a year and it has worked well so far.
Reviews of the Alldocube are positive as you might expect. See:
https://blog.patshead.com/2024/02/the-alldocube-iplay-50-mini-is-your-nexus-7-for-2024.html