Go down and check coupons out. Remember to check price history if it is available. Do you want to know what the best price is?
CPU: Helio A25(MT6762V/WD), 8*Cortex-A53 1.8GHz+1.5GHz, GPU: IMG GE8320 Up to 650Mhz, Card Extend: T-flash Card, 12nm, ROM: 128GB, up to 256GB(Maximum support 2TB (64GB and above have compatibility issues with computer formats, need to format and expand the phone), OS: Android 10.0, RAM: 4GB
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 Hong Kong. I couldn’t find any coupon for this product on latest product update.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): Email5, BGDGN30, BGN30DG, 13f142, BG8OFFCOUPON
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Price history (for all/most countries) for DOOGEE N30 4/128GB A25 is here.
Price records source(s): Banggood
Click on image to enlarge. 
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)).