Latest update shows that HS18421 1/18 RC Car with 3 Batteries costs $105.75 (in Banggood). Just check coupons out (with price alert and history). Best price?
Color: blue/yellow/red, Using time: 40min, 3 wire digital servo, 2WD/4WD: 4WD, Product size: 26*18.5*12cm, 7.4V 1500mah Li battery(included), “Frequency: 2.4GHz, Proportional control: YES”, Material: PVC”, Wheelbase: 165mm, Brushless motor, Battery: 3x 1.5V AA batteries(not included)”, “Models: HS18421 18422 18423, Rotation ratio: 13: 1, Function: forward /backward /left /right, Speed: 60km/h, Package size: 28*28*15.5cm, 40A Stepless speed regulator, Control distance: about 70m, “Charge time: 3h, Scale: 1: 18
Latest coupon code price check (UTC time):
Banggood ($105.75)
Banggood warehouse is located in China. As you can see I didn’t find any active coupon for this product right now… Is it a reasonable price for this item? Well, this price is higher than average price ($99.31)
Link: Banggood product page
Price: $105.75
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
There were country-specific coupon codes published on Couponsfromchina social channels and price alerts. Coupon price may vary by country, because there’re different VAT rates, shipping cost etc. There is a chance that some latest coupons are still working:
Old coupons (from the oldest to the newest): BG44e545, BGVehicle10, BGVehicles10, BG10RCVE, BG12RCCA, ADMITAD2212, BGCityadsRC, Terence, Tabby20, 2203ActiesNL, BG1efeb0, 8Couponsde, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, BG8RCToy, BGCAPITALOS8, BG5RCCar, BGRCCar5
(probably won’t work, but you can try them out)
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Check out price history chart (for all/most countries) for HS18421 1/18 RC Car with 3 Batteries.
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)).