Just check coupons out (with price alert and history). Let’s see what best price is ATM.
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Color Yellow, Relative Humidity 45% to 95%, Temp Control Digital Temperature Control, Heating Temp 0 ~ 320℃ / 32 ~ 608℉, Fit For PPR / PB / PE Pipe, Material Metal, Ambient Temperature -20 ~ 50℃ / -4 ~ 122℉, Product Name Pipe Welding Machine Kit, Type 600W / 800W / 1000W / 1400W, Plug EU Plug, Heating Speed 1 Min
Banggood
Banggood warehouse is located in China. I am tired of searching coupons, but I found one for you…
Link: Banggood product page
1. ($58.09): BGGines
apply code in your basket (cart) after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG6d2f05, BGTools8, BG490c0a, BG9a0a24
(there’s a little possibility that old coupon will work)
Price history and price alert
Check out price history chart (for all/most countries) for Pipe 1000W 20-63mm Plastic Welding Tool.
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)).