Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. I found coupon for you. Check this out.
Link: Banggood product page
Coupon (272.69 USD): BGCuponation10
(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
Old coupons (from the oldest to the newest): Wholesale20, BGEGM35, BGBFCR29, BGEGM36, BGCITYADS2019, BGEGM38, BGEGM39, BGEGM50, BGEGM51, BGEGM52, BGBYEG8, aff7off, Email5, bGhOnEy10, BGMyEGB, bgshOOp10, 7d18f7, BGM3023
(there’s a little possibility that old coupon will work)
Price history and price alert
Here is price history (for all/most countries) for E-Global M3 Mini PC i3 5005U 8/256GB.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).