Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. There is one coupon right now! Check this out.
Link: Banggood product page
Coupon (202.39 USD): BGCAPITALOS8
(CouponsFromChina.com tip: apply it in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BGSaleFeb8, BGSaleAD, BGET12, BGMARCHSALE, BG20236Tool, BGET10, BGf703a0, BGCOUPERT8
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for SPARK MIG145 Semi-automatic Non Gas Welding Machine.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).