Use coupon and get Mini UPS Uninterruptible Power Supply 10400mAh Battery Backup 5V 9V 12V for $29.99 (from Banggood). Price history, coupons and price alert are available on this page. Best price?
Latest price update (UTC time):
Mini UPS Uninterruptible Power Supply 10400mAh Battery Backup 5V 9V 12V for Router Monitor Camera High Capacity Portable Power Bank with Multiple Voltage Outputs
Banggood ($29.99)
Banggood warehouse is located in China. I don’t think there is an active coupon right now – at least in my database. You probably want to know if this is a good price. Well, this price is higher than average price ($27.74)
Link: Banggood product page
Price: $29.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
There were country-specific coupon codes published on Couponsfromchina social channels and price alerts. Coupon price may vary by country, because there’re different VAT rates, shipping cost etc. There is a chance that some latest coupons are still working:
1. (18.11.2024, $25.49): BG9ba2ed
Item: Mini UPS Uninterruptible Power Supply 10400mAh Battery Backup 5V 9V 12V
Countries: CzechRepublic, Greece, Hungary, Poland, Slovakia(SlovakRepublic), Slovenia
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for Mini UPS Uninterruptible Power Supply 10400mAh Battery Backup 5V 9V 12V.
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)).