Latest update shows that Plastic Welding costs 31.59 USD (in Banggood). You can create price alert here, copy coupons and view price history. Do you want to know what the best price is?
Latest price update (UTC time):
Banggood (31.59 USD)
Banggood warehouse is located in China. There is no active coupon in my database right now (for Banggood). Is it cheap? Hmmm, price is higher than average (which is 26.65 USD right now), so better set price alert down below…
Link: Banggood product page
Price: 31.59 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BGc728d3, BGGines, BGd2f208, BGET12, BG20236Tool, BGET10, BG8FORMULAMX
(these codes were not working in latest coupon update, but you can check them out anyway)
Aliexpress
Click here… to search for 70W Hot Stapler Plastic Welding Machine on Aliexpress
Here are coupons that you can use.
Price history and price alert
Price history (for all/most countries) for 70W Hot Stapler Plastic Welding Machine is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).