You can get Realacc 5.8G 5dBi 50W for 6.99 USD using coupon code (in Banggood). Price history, coupons and price alert are available on this page. What is best price?
Latest coupon code price check (UTC time):
Banggood (6.99 USD)
Banggood warehouse is located in China. There is no active coupon in my database right now (for Banggood). Well, is it a good price anyway? IMHO this is a good price, coz it’s lower than average (9.79 USD)
Link: Banggood product page
Price: 6.99 USD
Old coupons (from the oldest to the newest): Parts8, BGRCParts8, Tabby20, BG1efeb0, 8Couponsde, MVC8SPRING, BG8RCToy, BGJUNEGSG9, BGRCT10, Cuponation9, BGToys8
(you can check these old coupons out, but these probably won’t work)
Aliexpress
Click here… to search for Realacc 5.8G 5dBi 50W FPV Pagoda Antenna on Aliexpress
Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for Realacc 5.8G 5dBi 50W FPV Pagoda Antenna.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).