Tablet Onda V719 3G in China you can buy for 399 yuan (about 49€).
The device features a 7-inch screen
with a resolution of 1024 x 600 pixels, dual-core processor clocked at MediaTek MT8312
1.2 GHz and 8 GB of memory for data expandable via microSD card. Tablet also has Wi-Fi, Bluetooth 4.0, 3G
calling function, VGA webcam, 2 megapixel camera, a typical set of connectors, and battery capacity of 3000 mAh
Tablet has a 190 × 109 × 8.5 mm, weighs 295 grams and runs on Android 4.2.2 Jelly Bean.