RAM: DDR3L 8GB, Ethernet: 1000M LAN, CPU: Intel® Broadwell Processor i3-5005U Dual Core 2.0GHz (2C/4T 3M Cache), Graphics: Intel® HD Graphics 5500, WIFI: 802.11 a/b/g/n/ac, bluetooth: 4.0 (Intel 3165), Storage M.2 SSD: 512GB, OS: Support Windows 10.
Just check coupons out (with price alert and history). Let’s see what best price is ATM.
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
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 China.
Link: Banggood product page
1. ($327.59): 7bcdf9
2. ($327.59): 7BCDF9
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 and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): elec, BGCITYADS2019, bGpAnDacHeCk, bGhOnEy10, BGAFF10OFF
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Check out price history chart (for all/most countries) for Beelink L55 i3-5005U 8/512GB Mini PC. The lowest price was: $265.99.
Price records source(s): Gearbest, 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)).