$16.99 – XY-UDP Digital USB DC Converter CC CV 0.6-30V 5V 9V 12V 24V 2A 15W Power Module Desktop Adjustable Regulated Power Supply.
Latest update shows that XY-UDP Digital USB DC Converter costs $16.99 (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 coupon code price check (UTC time):
Banggood ($16.99)
Banggood warehouse is located in China. So I have checked for active coupons (all category coupons and old ones), but there was no working coupon in Banggood. Is it cheap? From what I can see this price is higher than average price ($11.99).
Link: Banggood product page
Price: $16.99
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BG589b2e, BG3aa3e2
(you can check these old coupons out, but these probably won’t work)
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Price history (for all/most countries) for XY-UDP Digital USB DC Converter is here. The lowest price was: $9.99.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).