Aliexpress
Click here… to search for Mini F3 Deluxe 10DOF Flight Controller RC on Aliexpress
Here are coupons that you can use.
Other warehouses/versions
This item is available in 3 another warehouse/versions!
1. China – Mini F3 ACRO 6DOF Brushless Flight Controller (-3 USD)
2. Europe – Mini F3 ACRO 6DOF Brushless Flight Controller [EU] (-3 USD)
3. Europe – Mini F3 Deluxe 10DOF Flight Controller RC [EU] (-3 USD)
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. I found coupon for you. Check this out.
Link: Banggood product page
Coupon (21.61 USD): BGHONEY2110
(CouponsFromChina.com tip: apply it 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): e2bcea, 502C6B, TTxBG10, d8f2bb, bgssaff9, AFfbG10, BGCITYADS2019, BGGEPPart, BGVDay10%off, 0e7f33, FBCOUPON1, BGAFF10OFF, bGhOnEy10, BGdragonBoat, bgshOOp10, BGRC902, BgoFErTaSchInA10, BgcLuBofErtA10, BG11Racer, BGCuponation10, BGDAVIS, ADMITAD2212
(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 3 another warehouse/versions!
1. China – Mini F3 ACRO 6DOF Brushless Flight Controller (-3 USD)
2. Europe – Mini F3 ACRO 6DOF Brushless Flight Controller [EU] (-3 USD)
3. Europe – Mini F3 Deluxe 10DOF Flight Controller RC [EU] (-3 USD)
Price history and price alert
Here is price history (for all/most countries) for Mini F3 Deluxe 10DOF Flight Controller RC.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).