$6.29 – Material: PC, Number of blades: 4-blade, Paddle disk diameter: 40.8mm, Weight / G: 0.61G, Maximum blade width: 7.46mm, Adaptation motor: 1103-1105 Recommended motor: 1103, Center hole inner diameter: 1.5MM, Pitch: 3.5in, Center thickness: 5.2mm.
ATM you can buy 4 Pairs Gemfan 1636 1.6×3.6×4 40mm 1.5mm Propeller for $6.29 (in Banggood). Price history, coupons and price alert are available on this page. Best price?
Latest coupon and price update (UTC):
Banggood ($6.29)
Banggood warehouse is located in China. There are no coupons available at this moment in Banggood. But wait a sec… Is it a good price? From what I can see this price is higher than average price ($4.77).
Link: Banggood product page
Price: $6.29
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): 10Gemfan, bgssaff9, AFfbG10, BG12MRP, BGGEPPart, BGVDay10%off, Parts8, BGAFF10OFF, BGTT10, bGhOnEy10, BGdragonBoat, BGSS10%SW, BGRC902, BgoFErTaSchInA10, BgcLuBofErtA10, BGDAVIS, BGHONEY2110, 13f142, BGGAL8, BGJON8, BGRCParts8, Tabby20, BG1efeb0, 8Couponsde, MVC8SPRING, 8BGwbg2204, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, BG8RCToy, BGRCT10, BGJUNEGSG9, TTSUMMER8, Cuponation9, BGMatt2022, BGToys8, BG589b2e
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
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.
Price history and price alert
Check out price history chart (for all/most countries) for 4 Pairs Gemfan 1636 1.6×3.6×4 40mm 1.5mm Propeller. The lowest price was: $4.58.
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)).