I have just checked coupons. The lowest price I could get is $121.99 for FNIRSI SG-004A Signal Generator 0-24V 4-20mA (in Banggood). Get coupons, create price alert or check price history out! Let’s see what best price is ATM.
Thermocouple Signal, Program Output, DC Voltage / Current, RTD Signal, 24V Power Distribution Output, Analog Source
Latest coupon code price check (UTC time):
Banggood ($121.99)
Banggood warehouse is located in China. As you can see I didn’t find any active coupon for this product right now… Price? This price is higher than average price ($114.99) for this item.
Link: Banggood product page
Price: $121.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGCL88, BG51943, BGM1TOOLS88, BGMARCHSALE, BG20236Tool, BGTOOS729, BG8FORMULAMX, BGBFDAY8, BGNEWYEAR8, BGSPRING8OFF, BGHONEYSP
(these coupons are old, so probably won’t work)
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 FNIRSI SG-004A Signal Generator 0-24V 4-20mA.
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)).