ATM you can buy 6 Pairs iFlight Nazgul F5 5.1Inch 3-blade 5mm RC Propeller for $11.5 (in Banggood). Basically copy coupon, view price history or create e-mail price alert. Best price?
Brand Name: iFlight, Mounting: 5mm center hole, Shaft: 5mm, Weight: 3.9g, Blades: 3 blades, Pitch: 3.5, Quantity: 2pair/bag, Hub Thickness: 6.3mm, Model: Nazgul F5, Color: Transparent Grey / Transparent cyan / Transparent green /Transparent yellow（Optional）, Propeller Diameter: 5.1inch, Material: polycarbonate, Hub Diameter: 13mm, , , Item Name: Nazgul F5 5 Inch Durable 3-Blades Propeller, Total: 6 CW & 6 CCW
Latest price update (UTC time):
Banggood ($11.50)
Banggood warehouse is located in China. Hmmm… There is no active coupon in Banggood at this moment. The question is – is it a good price? From what I can see this price is higher than average price ($9.49).
Link: Banggood product page
Price: $11.5
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGRCParts8, BG1efeb0, 8Couponsde, MVC8SPRING, 8BGwbg2204, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, BG8RCToy, BGJUNEGSG9, BGRCT10, TTSUMMER8, Cuponation9, BGMatt2022, BGToys8, BG25d4e7, BG589b2e
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – 6 Pairs iFlight Nazgul F5 5.1Inch 3-blade 5mm RC Propeller [EU] ($-3)
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Do you need price history chart (for all/most countries) for 6 Pairs iFlight Nazgul F5 5.1Inch 3-blade 5mm RC Propeller? There we go.
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)).