Latest update shows that Soldering Mat 400x300mm costs $29.99 (in Banggood). Basically copy coupon, view price history or create e-mail price alert. What is best price?
Latest coupon and price update (UTC):
Soldering Mat with Silicone Welding High Temperature Magnetic Non-Slip Patented welding Pad – 400*300mm
Banggood ($29.99)
Banggood warehouse is located in China. I don’t think there is an active coupon right now – at least in my database. Is it good price? This price is higher than average price ($16.39) for this item.
Link: Banggood product page
Price: $29.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Check out price history chart (for all/most countries) for Soldering Mat 400x300mm.
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)).