Aliexpress
Click here… to search for MFU A905 4000mAh Tri SIM Phone on Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. I am tired of searching coupons, but I found one for you…
Link: Banggood product page
Coupon (60.33 USD): BG55d4b2
(CouponsFromChina.com tip: you should apply the coupon in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): od7off, fphone, 502C6B, BGBK15, BGBAK15, BGdragonBoat, BgcLuBofErtA10, BGAFF10OFF, BGCuponation10, 13f142, BGHONEY2110, 6GSGIT
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Price history (for all/most countries) for MFU A905 4000mAh Tri SIM Phone is here.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).