I have just checked coupons. The lowest price I could get is 230.99 USD for RC Helicopter RTF with (in Banggood). Go down and check coupons out. Remember to check price history if it is available. Let’s see what best price is ATM.
Latest coupon code price check (UTC time):
Banggood (230.99 USD)
Banggood warehouse is located in China. Hmmm… There is no active coupon in Banggood at this moment. Price? Maybe there’re no more promotions for this item, because current price is higher than average (which is equal 222.43 USD)
Link: Banggood product page
Price: 230.99 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BGE135RC, BGMatt2022, BG2471a6, BGRJEE135, BGAUGUST8, BGCOUPERT8, BGCAPITALOS8
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Aliexpress
Here are coupons that you can use.
Price history and price alert
Price history (for all/most countries) for Eachine E135 2.4G 6CH Brushless RC Helicopter RTF with 2 Batteries is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).