$41.99 – FNIRSI 0.25mm Spot Welder 4 Gears Adjustable DIY Mini Spot Double Pulse Welding Machine 18650 Battery Pack Welding Tool Built-in 5000mAh Battery.
$41.99 – that is current price with coupon for FNIRSI 0.25mm Spot Welder (in Banggood). Basically copy coupon, view price history or create e-mail price alert. What is best price?
Latest coupon code price check (UTC time):
Banggood ($41.99)
Banggood warehouse is located in China. I don’t think there is an active coupon right now – at least in my database. Is it a reasonable price for this item? Well, this price is higher than average price ($39.70)
Link: Banggood product page
Price: $41.99
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BG424324, BG84b6d7, BGe245a9, BG2dd9fa, BG59c751, BGe3090d, BGPowerTLS2
(there’s a little possibility that old coupon will 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
Here is price history (for all/most countries) for FNIRSI 0.25mm Spot Welder. The lowest price was: $33.99.
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)).