I have just checked coupons. The lowest price I could get is 218.99 USD for 6CH 3D6G (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 (218.99 USD)
Banggood warehouse is located in China. Coupons for Eachine E150 2.4G 6CH 3D6G Brushless RC Helicopter RTF with 2 Batteries? Nope, there’re no coupons in Banggood. Is it a reasonable price for this item? This is the best price in history according to CouponsFromChina database!
Link: Banggood product page
Price: 218.99 USD
218.99 USD – This is the best price ever noted in my database!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BG3dc130, 00c906, BGE1500, BGEachine10, BGbb9cb6, BGRCEachine, BGheli010, BGAlerabat1, BG8ca4e9, BGheli3, BG57a193, BGd3f5e3, BG6f2070, BG069174, BGb0ec6b, BG3463ba, BG75a717, BGRCT10, BGfe0919, BG772e24, BGToys8, JanBGCoupon8, BGSaleAD, BGMatt2022, BGMARCHSALE, BGCAPITALOS8, BG8FORMULAMX
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – Eachine E150 3D6G RC Helicopter RTF FUTABA S-FHSS with 3 Batteries (223.99 USD)
Aliexpress
Click here… to search for Eachine E150 2.4G 6CH 3D6G Brushless 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 Eachine E150 2.4G 6CH 3D6G Brushless RC Helicopter RTF with 2 Batteries.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).