Go with the Samsung Galaxy Tab A 10.1" variant. I'm not sure about its exact price but as far as I know it comes under $300.
RAM - 2 GB
Storage - 16 GB
Processor - Exynos 7870 1.6 GHz Octa-Core Processor
As you just said that you want it for watching movies and videos, for that it has amoled display which produces bright and rich colors and causes less eye-strain in dark conditions. However, internal storage is quite low but you can add further using a micro sd card.