You can create price alert here, copy coupons and view price history. Do you want to know what the best price is?
ROM: 16G, Quad core ARM Cortex-A53, WIFI: 2.4G, CPU: Allwinner H6, OS: Android 9.0, RAM: 2G DDRIII, GPU: Mali-T720, Ethernet: 100M LAN, up to 1.5 GHz, Video decode: H.265
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 China. There is one great coupon!
Link: Banggood product page
1. ($40.16): 6GSGIT
this code has to be applied 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/5cd
Old coupons (from the oldest to the newest): elec, BGsdlkflkll, 502C6B, 0e7f33, FBCOUPON1, BGVSTX6MN, BGAFF10OFF, 13f142
(there’s a little possibility that old coupon will work)
Price history and price alert
Price history (for all/most countries) for Tanix TX6 Mini 2/16GB TV Box 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)).