Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (177.44 USD): BG1efeb0
Coupon (179.37 USD): Terence
Coupon (179.37 USD): 2203ActiesNL
Coupon (181.30 USD): BG00c906
(CouponsFromChina.com tip: apply code in your basket (cart) after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BGVehicle10, BGVehicles10, ADMITAD2212, BGCityadsRC, Tabby20
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Do you need price history chart (for all/most countries) for HuiNa 593 RTR RC Excavator? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).