Basically copy coupon, view price history or create e-mail price alert. You probably want to know what is the best price?
2.0GHz, ARM Cortex-A53, 100Mbps Ethernet, Support 4K ultra HD image display, Support H.265 decoding, 2.4GHz + 5GHz dual band WiFi, Quad core, Android 9.0 operation system, Mali G31 MP2 GPU, 4GB DDR4 RAM + 64GB EMMC ROM, Amlogic S905X2 CPU
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 and price update (UTC):
Banggood
Banggood warehouse is located in China. You can get coupon down below.
Link: Banggood product page
1. ($77.14): Email5
apply it in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): elec, c9a17a, 502C6B, BGBFAFF2019, BGCITYADS2019, BGMPB2020, 7d18f7
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – MECOOL KM3 4/64GB S905X2 VC TV Box [EU] ($-3)
Price history and price alert
Check out price history chart (for all/most countries) for MECOOL KM3 4/64GB S905X2 VC TV Box.
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)).