SDRAM 8GB, LAN Ethernet: 10/100M/1000M standard RJ-45, USB 1 Type-A USB3.0 / 1 Type-A USB2.0, HDMI HDMI 2.0a for 4k@60Hz, DisplayPort HDMI, GPU Mali-G52 2EE, SPDIF/IEC958 Optical, Power Indicator (LED) Power ON: blue; Standby: Red, Remote IR, Chipset RK3566 Quad-Core 64bit Cortex-A55 @1.8GHz, Bluetooth V4.2, Wireless 2.4G/5G dual-band Wifi 802.11 a/b/g/n/ac, FLASH EMMC 128GB.
You can create price alert here, copy coupons and view price 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 price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($92.60): BGAlerabat6
2. ($96.72): BG00c906
paste coupon code in your cart and click Apply after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): 7bcdf9, Tabby20
(probably won’t work, but you can try them out)
Price history and price alert
Check out price history chart (for all/most countries) for X88 PRO 20 RK3566 8/128GB TV Box. The lowest price was: $84.99.
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)).