Just check coupons out (with price alert and history). What is best price?
Black
Aliexpress
There’re some similar (or not) items on Aliexpress
| Image | Product (link) | Price | Coupons |
|---|---|---|---|
 |
KINGKONG/LDARC 10 Pairs Kingkong 5x4x4 5040 5 Inch 4-Blade Propeller CW CCW for FPV Racer | $12.29 | – |
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. I don’t think there is an active coupon right now – at least in my database.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): aff7off, CFadmitad, e2bcea, 502C6B, AFfbG10, BGVDay10%off, BGAFF10OFF, bGhOnEy10, BGdragonBoat, BGSS10%SW, BGRC902, BgoFErTaSchInA10, Parts8, BgcLuBofErtA10, BGDAVIS, BGHONEY2110
(probably won’t work, but you can try them out)
Price history and price alert
Price history (for all/most countries) for 10 Pairs Kingkong/LDARC 5040 5x4x3 3-Blade RC is here.
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)).