Just check coupons out (with price alert and history). What is best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
, Item: 1/16 German Panther Battle Tank, Engine Sound, The sound can be Adjusted Box Size: 55.5*25.5*27.5cm, Frequency: 2.4Ghz, Weight: About 4200g, Product Size: 52*24*20 cm, Machine-Gun Sound, Shooting Balls, Start-up / Extinguish Set, Brand: Heng Long, 1*SC 3.7V Ni-cd 1200mAh Rechargeable Battery, Realistic Smoking Function, Cannonball Sound, Main Material: ABS Plastic, Battery Required: 8*AA batteries Battery Required (for Tank): , Emulational Action Effect, Full Scale R/C Function, Recommended Age: 14+ Drive Gearbox, Item NO.: 3819-1, Simulative motor start-up sound
Banggood
Banggood warehouse is located in China. I am tired of searching coupons, but I found one for you…
Link: Banggood product page
1. ($116.94): BGHONEY2110
just apply this code in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGTank10, AFfbG10, 502C6B, BGBFAFF2019, BGCITYADS2019, BGAFF10OFF, bGhOnEy10, BGdragonBoat, BGSS10%SW, bgshOOp10, BGRC902, BgoFErTaSchInA10, BgcLuBofErtA10, BGCuponation10, BGDAVIS
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for Heng Long 3819-1 German Panther RC Tank.
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)).