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 (240.14 USD): tRaDetRaCKeR
Coupon (240.14 USD): 8wEbgaInS5
Coupon (242.75 USD): 2203ActiesNL
Coupon (245.36 USD): BG00c906
(CouponsFromChina.com tip: put item in your cart and apply coupon code there 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): BGSETP10N, BGRC902, BgoFErTaSchInA10, bGhOnEy10, BGWL1024, BgcLuBofErtA10, BGAFF10OFF, BGCuponation10, BGDAVIS, BGHONEY2110, BGVehicle10, BGVehicles10, CouponsDE, ADMITAD2212, BGCityadsRC, Terence, Tabby20, BG1efeb0, 8Couponsde, MVC8SPRING, 8BGwbg2204
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Here is price history (for all/most countries) for Wltoys 14800 RC Bulldozer.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).