You can get FNIRSI DSO-TC3 Digital Oscilloscope for $36.99 using coupon code (in Banggood). Just check coupons out (with price alert and history). What is best price?
FNIRSI DSO-TC3 Digital Oscilloscope Transistor Tester Function Signal Generator 3 in 1 Multifunction Electronic Component Tester – DSO-TC3 (Standard)
Latest coupon code price check (UTC time):
Banggood ($36.99)
Banggood warehouse is located in China. You probably want to know if this is a good price. My database says that it’s pretty good price, coz average is $40.58. There is one great coupon!
Link: Banggood product page
Price without coupon: $42.99
1. ($36.99): BG1609cb
coupon code has to be applied in shop’s cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGM1TOOLS88, BG6MEGA24, BG20236Tool, BGTOOS729, BGbde828, BGfce136
(these codes were not working in latest coupon update, but you can check them out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – FNIRSI DSO-TC3 Digital Oscilloscope [EU] ($-3)
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
Price history (for all/most countries) for FNIRSI DSO-TC3 Digital Oscilloscope is here.
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)).