You can create price alert here, copy coupons and view price history. Best price?
10 minutes fixed sleep mode Yes, Temperature Range 200~480°C, Tip of ground Resistance <2Ω, Model 938D, Work temperature 0~40°C, Celsius/Fahrenheit Display Temperature conversion mode Yes, Power 120W, Voltage AC 220V±10% 50Hz/AC 110V±10% 60Hz, Storage temperature -20°C~80°C, Stability of temperature ±2°C(static state), Tip of ground Voltage <2mV, Storage humidity 35%~45%, Temperature display LED digital display
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in Europe 
. I don’t really know if this price is reasonable, coz there’s no price history in my DB. Well, there is one coupon available right now.
Link: Banggood product page
1. ($45.04): CityadsTool
this code has to be applied in your 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): 5efba1, BG938D, BGYH938D, elec, BGsolder15, BG938D1, BG15sh, AFfbG10, WELDTOOL, BGAFF10OFF, BGTT10, bGhOnEy10, BGherra, BGdragonBoat, BGSS10%SW, BgoFErTaSchInA10, BgcLuBofErtA10, BGRUS15, BGWELDTOOL, BGCuponation10, 13f142, BG372479, BG7d39db, BGc225cb, BANGGOODSD, 6GSGIT, BGed73bf, BG8a7644, 00c906
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
There is only one database record (it was for $36.99), so you can’t see price history chart.
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)).