Ah.
This is a dual core, 1GB Ram 1024x600: $99. I think it would word pretty well for what you want.
Othello - Dual Core Android 4.1 Tablet with 7 Inch Capacitive Screen (8GB, WiFi, 1.6GHz) - USD $ 99.99
It's an ARM A9, so I'm guessing it is a RK3066 based tablet. Really, not bad specs for $99. You can load your video content on 32GB SD cards.