When I was updating this page, then coupon price was $26.99 for Handheld Spot Welder 5000mAh (in Banggood). Just check coupons out (with price alert and history). You probably want to know what is the best price?
Latest coupon code price check (UTC time):
Portable Handheld Spot Welder with LCD Display 80 Gear Power Adjustable 5000mAh Lithium Polymer Battery Capable of Mobile Battery Welding Ideal for DIY and Professional Use
Banggood ($26.99)
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 expensive? Good price! It’s lower than average one ($27.91)!
Link: Banggood product page
Price: $26.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
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 Handheld Spot Welder 5000mAh.
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)).