Mini F3 ACRO 6DOF Brushless Flight Controller (Banggood, Aliexpress: Package Contents: 1x Flight Controller, 1x Set of Cables, 1x Pack of Pin Headers (the best price with coupon)).
Go down and check coupons out. Remember to check price history if it is available. What is the best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($14.28): BG11Racer
2. ($14.44): BGAFF10OFF
3. ($14.44): bGhOnEy10
4. ($14.44): BgcLuBofErtA10
put item in your cart and apply coupon code there after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): e2bcea, 502C6B, TTxBG10, d8f2bb, bgssaff9, AFfbG10, BGCITYADS2019, BGGEPPart, BGVDay10%off, 0e7f33, FBCOUPON1, BGdragonBoat, bgshOOp10, BGRC902, BgoFErTaSchInA10, BGCuponation10, BGDAVIS, BGHONEY2110, ADMITAD2212
(probably won’t work, but you can try them out)
Other warehouses/versions
This item is available in 3 another warehouse/versions!
1. China – Mini F3 Deluxe 10DOF Flight Controller RC ($-3)
2. Europe – Mini F3 ACRO 6DOF Brushless Flight Controller [EU] ($-3)
3. Europe – Mini F3 Deluxe 10DOF Flight Controller RC [EU] ($-3)
Price history and price alert
Here is price history (for all/most countries) for Mini F3 ACRO 6DOF Brushless Flight Controller. The lowest price was: $6.99.
Price records source(s): Gearbest, 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)).