I have just checked coupons. The lowest price I could get is 153.99 USD for Helicopter RTF with (in Banggood). Just check coupons out (with price alert and history). Let’s see what best price is ATM.
Latest coupon and price update (UTC):
Banggood (153.99 USD)
Banggood warehouse is located in China. I don’t think there is an active coupon right now – at least in my database. I think you want to know if the price is good. This price is higher than average price (143.99 USD) for this item.
Link: Banggood product page
Price: 153.99 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Aliexpress
Click here… to search for RC ERA C123 1:36 EC135 RC Helicopter RTF with 2 Batteries on Aliexpress
Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for RC ERA C123 1:36 EC135 RC Helicopter RTF with 2 Batteries.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).