It looks like, the demand for the Redmi 4 has been depreciating, as the Redmi 4 (with 4 GB RAM and 64 GB onboard storage) is now available on open sale until the stock lasts.
The device is now available on Amazon India in Gold and Black colour options.
Redmi 4 is a feature-rich budget android smartphone powered by Qualcomm Snapdragon 435 SoC. The device offers best in class metal unibody design with 5 inch HD IPS LCD display, protected by 2.5D curved glass.
The device offers 13 MP main camera and 5 MP front facing selfie camera with 1080p video recording capability. The 4000 mAh battery is one more attraction about the Redmi 4. The device runs on Android Marshmallow and expected to receive Android Nougat along with MiUi V9.
Here is direct Amazon link if you want to purchase the device. Redmi 4 Gold &Black