Aliexpress
Click here… to search for ImmersionRC Mini Patch 5.8GHz LHCP FPV Antenna on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (9.22 USD): BGTT10
Coupon (9.22 USD): bGhOnEy10
Coupon (9.24 USD): 13f142
(CouponsFromChina.com tip: paste coupon code in your cart and click Apply 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): bgshOOp10
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Do you need price history chart (for all/most countries) for ImmersionRC Mini Patch 5.8GHz LHCP FPV Antenna? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).