Aliexpress
Click here… to search for Xiaomi Roidmi 2S Chinese Version on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (14.44 USD): e2bcea
Coupon (15.29 USD): TTxBG10
Coupon (15.8 USD): aff7off
(CouponsFromChina.com tip: put item in your cart and apply coupon code there after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Price history and price alert
Do you need price history chart (for all/most countries) for Xiaomi Roidmi 2S Chinese Version? There we go.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).