I am monitoring price for 8GB RAM RK3566 and it is for 62.99 USD now (in Banggood). Basically copy coupon, view price history or create e-mail price alert. You probably want to know what is the best price?
Latest coupon and price update (UTC):
Banggood (62.99 USD)
Banggood warehouse is located in China. Hmmm… There is no active coupon in Banggood at this moment. I think you want to know if the price is good. Good news! This is great price, coz it’s the lowest in CouponsFromChina database!
Link: Banggood product page
Price: 62.99 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BGCAPITALOS8
(I don’t think these’re gonna work, but you can try ’em out anyway)
Aliexpress
Click here… to search for Orange Pi 3B 8GB RAM RK3566 Board on Aliexpress
Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for Orange Pi 3B 8GB RAM RK3566 Board.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).