When I was updating this page the price was 55.99 USD for Adjustable DC Regulated (in Banggood). You can create price alert here, copy coupons and view price history. Do you want to know what the best price is?
Latest coupon and price update (UTC):
Banggood (55.99 USD)
Banggood warehouse is located in China. Hmmm… There is no active coupon in Banggood at this moment. Good or bad price? From what I can see this price is higher than average price (52.04 USD).
Link: Banggood product page
Price: 55.99 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BG30cdbd, BGe245a9
(these codes were not working in latest coupon update, but you can check them out anyway)
Aliexpress
Click here… to search for DH-3005 Adjustable DC Regulated Power Supply 30V 5A on Aliexpress
Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for DH-3005 Adjustable DC Regulated Power Supply 30V 5A.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).