Aliexpress
There’re some similar items on Aliexpress in my database. There may be some other items though.
| Image | Product (link) | Price | Coupons |
|---|---|---|---|
 |
BSIDE A1 Dual-mode True RMS Multimeter Voltage Tester | 12.64 USD | – |
 |
BSIDE A1 Dual-mode True RMS Multimeter Voltage Tester | 14.66 USD | – |
More on Aliexpress… Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. I couldn’t find any coupon for this product on latest product update.
Link: Banggood product page
Price: -3 USD
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Old coupons (from the oldest to the newest): BG56669d, BGTOOS729
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Here is price history (for all/most countries) for BSIDE A1 Dual-mode True RMS Multimeter Voltage Tester.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).