6500mAh lithium battery (included), Package size: 170x 115x 90mm / 6.69x 4.53x 3.54in, Item size: 140x 80x 40mm / 5.51x 3.15x 1.57in, Battery: 2x 5V, Package weight: 423g / 14.92ounce, Name: Spot Welding Machine, Gears: 1-6 gears, Welding thickness: 0.1-0.15mm, Item weight: 355g / 12.52ounce.
Basically copy coupon, view price history or create e-mail price alert. Best price?
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.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($33.99): BGherra
2. ($33.99): BGWELDTOOL
paste coupon code in your cart and click Apply after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): BG71044, BGRU8144, BGqa3647
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Price history (for all/most countries) for Mini Spot Welder is here. The lowest price was: $23.99.
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)).