I have checked all old coupons and price is $14.99 for PD 65W Mini Hot Plate Preheater OLED (in Banggood). Basically copy coupon, view price history or create e-mail price alert. You probably want to know what is the best price?
PD 65W Mini Hot Plate Preheater OLED Display PCB Board Welding Heating Plate Rework Station Preheating Platform Repair Tool
Latest price update (UTC time):
Banggood ($14.99)
Banggood warehouse is located in China. As you can see I didn’t find any active coupon for this product right now… What about the price? It looks like it’s a good price (lower than average ($15.42)).
Link: Banggood product page
Price: $14.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG589b2e, BG20236Tool
(probably won’t work, but you can try them out)
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
Do you need price history chart (for all/most countries) for PD 65W Mini Hot Plate Preheater OLED? 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)).