You can create price alert here, copy coupons and view price history. What is the best price?
Accessories: Headphone/network cable/6P clip line, 20%-75%RH, Battery: 9V 6F22 (not include), Storage Environment: -10C-50C, Size: Receiver: 190*40*23mm/Launcher: 140*60*25mm, 10%-90%RH, Working Environment: 0-40C, Altitude: <=1000 meters, Distance of sending signal: 0-300m
Aliexpress
There’re some similar (or not) items on Aliexpress
| Image | Product (link) | Price | Coupons |
|---|---|---|---|
 |
MESTEK RJ11 RJ45 No Interference Telephone Wire Tracker Tracer Toner Ethernet Lan Network Cable NVC Line Finder Detector Tester | $51.18 | – |
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. One coupon is available. Cool!
Link: Banggood product page
1. ($47.12): BGherra
paste coupon code in your cart and click Apply 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): AFfbG10, BGMESTEK, BG15METER, bGhOnEy10, BGAFF10OFF
(these coupons are old, so probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for MESTEK WT58D RJ11 RJ45 Wire Tracker.
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)).