I am monitoring price for 12V/24V Solar Charge and it is for 17.54 USD now (in Banggood). Basically copy coupon, view price history or create e-mail price alert. You probably want to know what is the best price?
Latest coupon code price check (UTC time):
Banggood (17.54 USD)
Banggood warehouse is located in China. I don’t think there is an active coupon right now – at least in my database. Isn’t it too expensive? From what I can see this price is higher than average price (15.97 USD).
Link: Banggood product page
Price: 17.54 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BG42df5e, BG589b2e, BGET10
(I don’t think these’re gonna work, but you can try ’em out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – 50A 12V/24V Solar Charge Controller [EU] (-3 USD)
Aliexpress
Click here… to search for 50A 12V/24V Solar Charge Controller on Aliexpress
Here are coupons that you can use.
Price history and price alert
Price history (for all/most countries) for 50A 12V/24V Solar Charge Controller is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).