WLtoys V913 RC Helicopter RTF (Banggood, Aliexpress: Charging Time: About 60 Minutes, Transmitter Battery: 4x AA Battery (Not Included), Main Rotor Diameter: 50cm, Channel: 4 Channel, Weight: About 1848 g, Heli Size: 70*12*21cm, Control Distance: About 150m, Tail Rotor Diameter: 13cm, Helicopter Battery: Rechargable 7.4V 1500mAh (Included), Frequency: 2.4G, Item Name: WLtoys Large Single Blades RC Helicopter, Flying Time: About 8 Minutes (the best price with coupon)).
Basically copy coupon, view price history or create e-mail price alert. What is best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($146.56): Drones6
2. ($146.56): CouponsDE
3. ($146.56): 00c906
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 and https://couponsfromchina.com/short/feV
Old coupons (from the oldest to the newest): BGV91315, AFfbG10, BGMPB2020, BGAFF10OFF, bGhOnEy10, BGWLT12, BGdragonBoat, BGSS10%SW, bgshOOp10, BGheli10, BgoFErTaSchInA10, BgcLuBofErtA10, BGCuponation10, BGDAVIS, BGHONEY2110, BGMATT7, BANGGOODSD, 6GSGIT
(there’s a little possibility that old coupon will work)
Price history and price alert
Check out price history chart (for all/most countries) for WLtoys V913 RC Helicopter RTF. The lowest price was: $92.64.
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)).