Basically copy coupon, view price history or create e-mail price alert. What is best price?
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):
Cooling method: forced air cooling, Rated input current: 10.6A, Phase number: single phase 220V, Size: 23x 15x 10cm, Insulation class: F, Efficiency: 80%, Rated frequency: 50/60Hz, Rated load duration: 35%, No-load loss: 40W, Rated input voltage: 220V ± 10%, Welding Material: Iron and Steel, Current adjustment range: 20-200 stepless adjustment, No-load voltage: 65V, Rated output voltage: 28V
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($74.79): BGherra
2. ($74.79): BGWELDTOOL
paste coupon code in your cart and click Apply after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGZX7, elec, AFfbG10, BG23SW, BGCITYADS2019, Email3, BGVDay10%off, BG15PTools, BGAFF10OFF, bGhOnEy10, 577e05, BGdragonBoat, BGSS10%SW, BGTool15, BgcLuBofErtA10, BGZX72001, BGHONEY2110, 13f142, BANGGOODSD, BG8a7644, CityadsTool, BGGines, BGTools8
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – ZX7-200 220V 20-200A IGBT Welding Machine [EU] ($-3)
Price history and price alert
Do you need price history chart (for all/most countries) for ZX7-200 220V 20-200A IGBT Welding Machine? There we go.
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)).