Overall Length: 676mm, Item: V450D03 RC Helicopter, Channel: 6CH, Main Rotor Diameter: 712mm, Tail Rotor Diameter: 150mm.
Basically copy coupon, view price history or create e-mail price alert. Do you want to know what the best price is?
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. There is one great coupon!
Link: Banggood product page
1. ($301.45): BGheli3
put item in your cart and apply coupon code there after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGWA15, AFfbG10, 502C6B, BGV45012, BGBFAFF2019, BGCITYADS2019, BGD0315, BGD0312, BGV45003, BGZM15, BGVDay10%off, BGV45015, BGAFF10OFF, bGhOnEy10, BGAPR12, BGdragonBoat, BGSS10%SW, bgshOOp10, BGheli10, BgoFErTaSchInA10, BgcLuBofErtA10, BGCuponation10, BGDAVIS, BGHONEY2110, BGMATT7, Drones6, BANGGOODSD, 6GSGIT, CouponsDE, 00c906, BGheli010, 2022ACTIESNL, Tabby20
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Price history (for all/most countries) for Walkera V450D03 Generation II RC Helicopter BNF is here. The lowest price was: $198.04.
Price records source(s): Gearbest, 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)).