Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. Well, there is one coupon available right now.
Link: Banggood product page
Coupon (267.83 USD): BGdaa6b9
(CouponsFromChina.com tip: apply it in your 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): 8BGwbg2204, 2203ActiesNL, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, hoNEYbGdeAlS, BGRCT10, BGJUNEGSG9, BG8ReviTrage, BGea6b48, Cuponation9, 9OFFSUMMER, COUPONSDE1wk, BgGoodie9, BGbc9a4e, BGToys8, BG8OFFCOUPON, TTBLACK5, JanBGCoupon8, BGMARCHSALE, BGMatt2022
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Do you need price history chart (for all/most countries) for RGT 18100 RTR 1/10 2.4G 4WD RC Car? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).