Latest update shows that 6 Leaf Clover RC costs 10.99 USD (in Banggood). Just check coupons out (with price alert and history). Let’s see what best price is ATM.
Latest coupon code price check (UTC time):
Banggood (10.99 USD)
Banggood warehouse is located in China. There is no active coupon in my database right now (for Banggood). Low/high price? Cool, average is 13.32 USD, so current price is lower!
Link: Banggood product page
Price: 10.99 USD
Old coupons (from the oldest to the newest): BGEachine10, BGRCEachine, BGToys1, BGRCT10, BGToys8, BGMatt2022, BG589b2e
(you can check these old coupons out, but these probably won’t work)
Aliexpress
Click here… to search for Eachine K-Loverleaves 5.8G 5dBi 6 Leaf Clover RC Antenna on Aliexpress
Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for Eachine K-Loverleaves 5.8G 5dBi 6 Leaf Clover RC Antenna.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).