DANIU FG-100 Soldering Iron Tip Thermometer (Banggood, Aliexpress: ±5ºC (other than above), Power supply 006P 9V dry battery, Temperature sensor K (CA)type thermocouple, Temperature measurement range 0 to 700ºC, Temperature resolution 1ºC, Model No. FG-100, Temperature precision ±3ºC (300 to 600ºC) (the best price with coupon)).
Basically copy coupon, view price history or create e-mail price alert. Let’s see what best price is ATM.
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($17.66): BGPTL088
2. ($18.70): BGGines
3. ($19.53): BG00c906
this code has to be applied in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/feV
Old coupons (from the oldest to the newest): AFfbG10, BGVDay10%off, WELDTOOL, BGAFF10OFF, BGTT10, bGhOnEy10, BGDANIU, BGherra, BGTool15, BG172764, BG1727641, BGRUS15, BGWELDTOOL, BANGGOODSD, BG8a7644, 00c906, CityadsTool
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – DANIU FG-100 Soldering Iron Tip Thermometer [EU] ($-3)
Price history and price alert
Check out price history chart (for all/most countries) for DANIU FG-100 Soldering Iron Tip Thermometer. The lowest price was: $7.99.
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)).