Aliexpress
Click here… to search for Bwhoop75 75mm RC Frame Kit on Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (4.42 USD): BGAFF10OFF
Coupon (4.42 USD): BgcLuBofErtA10
Coupon (4.52 USD): Parts8
(CouponsFromChina.com tip: coupon code has to be applied in shop’s cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): Bwhoop75, 4whoop, 502C6B, BW75, TTxBG10, BGW75, BG75MM, BGTiny199, AFfbG10, BG1375mm, BGBFRC11, BGCITYADS2019, BGGEPPart, BGVDay10%off, BGTT10, bGhOnEy10, BGdragonBoat, BGSS10%SW, BgoFErTaSchInA10
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Here is price history (for all/most countries) for Bwhoop75 75mm RC Frame Kit.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).