I am monitoring price for Male to and it is for 4.59 USD now (in Banggood). Basically copy coupon, view price history or create e-mail price alert. Do you want to know what the best price is?
Latest price update (UTC time):
Banggood (4.59 USD)
Banggood warehouse is located in China. I don’t think there is an active coupon right now – at least in my database. Price? Maybe there’re no more promotions for this item, because current price is higher than average (which is equal 4.41 USD)
Link: Banggood product page
Price: 4.59 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BGToys8, BGMatt2022, BG589b2e
(I don’t think these’re gonna work, but you can try ’em out anyway)
Aliexpress
Click here… to search for XT90 Male to XT60 Female RC Plug on Aliexpress
Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for XT90 Male to XT60 Female RC Plug.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).