Aliexpress
Click here… to search for JHEMCU 30.5×30.5mm F7 RC Flight Controller Deluxe 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 (32.05 USD): BGHONEY2110
Coupon (32.76 USD): BGDAVIS
(CouponsFromChina.com tip: you should apply the coupon in your 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): BGJHEMCU, TTxBG10, bgssaff9, AFfbG10, 502C6B, BGCITYADS2019, BGGEPPart, BGVDay10%off, BGAFF10OFF, bGhOnEy10, BGdragonBoat, BGSS10%SW, bgshOOp10, BGRC902, BgoFErTaSchInA10, BgcLuBofErtA10, BGCuponation10
(these coupons are old, so probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for JHEMCU 30.5×30.5mm F7 RC Flight Controller Deluxe.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).