Aliexpress
Click here… to search for AOMWAY 5.8G 3dBi RP-SMA VTx/VRx 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 (12.16 USD): Parts8
Coupon (12.22 USD): 13f142
Coupon (12.22 USD): bGhOnEy10
(CouponsFromChina.com tip: 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
Old coupons (from the oldest to the newest): aff7off, rchobbies8, CFadmitad, e2bcea, 502C6B, f62884, BGss9%rc, bgssaff9, BGBCFPV, BGBCBG10, BGOTC21, BGBFAFF2019, BGCITYADS2019, BG9NY, BGSS10%SW, bgshOOp10, BGRC902, BGHALLOWEEN
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Do you need price history chart (for all/most countries) for AOMWAY 5.8G 3dBi RP-SMA VTx/VRx FPV Antenna? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).