You can create price alert here, copy coupons and view price history. Best price?
, RAM: 4GB, OS: Android 9.0, 12nm, Support MicroSD Card up to 256GB, 4*Cortex-A53, 4*Cortex-A73 2.1GHz, Card Extend: Yes, CPU: Helio P70, GPU: ARM Mali G72 MP3 900MHz, 2.0GHz, ROM: 64GB, Octa Core
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in Europe 
. This is new product in my database, so I don’t know if this price is good. I am tired of searching coupons, but I found one for you…
Link: Banggood product page
1. ($214.99): 7d18f7
paste coupon code in your cart and click Apply after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): Email5
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Other warehouses/versions
This item is available in 2 another warehouse/versions!
1. Hong Kong – DOOGEE S90C 4/64GB ($-3)
2. Europe – DOOGEE S90C 4/64GB [EU] ($-3)
Price history and price alert
There is only one database record (it was for $169.99), so you can’t see price history chart.
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).