Latest update shows that Portable DIY Mini Spot Welder 18650 costs $23.74 (in Banggood). Just check coupons out (with price alert and history). Best price?
Latest coupon and price update (UTC):
Battery: 18650 lithium battery(not included), Material: Metal, Length of welding pen: app.30cm/11.81in, Color: Red+Blue+Black, Quantity: 1Set, Input line length: app.20cm/7.87in
Banggood ($23.74)
Banggood warehouse is located in China. I couldn’t find any coupon for this product on latest product update. But wait a sec… Is it a good price? From what I can see this price is higher than average price ($19.99).
Link: Banggood product page
Price: $23.74
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGmini111, BGmini222, BGSTUDENT10, BGdiy12, BGGEE13, BGCuponation10, 13f142, BGHONEY2110, BGf13064, BGfeb901, BG90f9ba, BG6d4c2e, BG6af354, BG1efeb0, MVC8SPRING, tRaDetRaCKeR, BG525f34, hoNEYbGdeAlS, BGJUNEGSG9, BG8ReviTrage, Cuponation9, BGcoupon8off, BGGutscheine, BG00c906, BG8OFFCOUPON, TTBLACK5, BG589b2e
(you can check these old coupons out, but these probably won’t work)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – Portable DIY Mini Spot Welder 18650 [EU] ($-3)
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
Price history (for all/most countries) for Portable DIY Mini Spot Welder 18650 is here.
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)).