Display: TFT 2.4″ LCD Screen(320*240 resolution), Item: WM150 Watt Meter, Input Voltage: 1-50V, Current(Max): 150A (precision: 10mA), Gross Weight(Approx): 140g, Packing Size: 87*87*28mm Approx., Product Size: 80*54*23mm Approx., Output: PWM 1000-2000us@50Hz, USB: 5.0V@1A (USB3.0 firmware update), Net Weight(Approx): 120g.
Basically copy coupon, view price history or create e-mail price alert. What is the best price?
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. Well, there is one coupon available right now.
Link: Banggood product page
1. ($31.27): BGMatt2022
put item in your cart and apply coupon code there after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGWM15012, BGWM15015, BG150A15, 0e7f33, BGSPN15, bGhOnEy10, BGTOOKRC15, BGROK9, BGNEE20, BGTWM20, BGAFF10OFF, BGCuponation10, BG15WM150, BGDAVIS, BGHONEY2110, BGWM150, 13f142, Parts8, BGWM150issam, BGRCParts8, 2022ACTIESNL, Tabby20, BG1efeb0, 8Couponsde, 8BGwbg2204, hoNEYbGdeAlS, BGRCT10, BGJUNEGSG9, BG8ReviTrage, Cuponation9, TTBLACK5
(these coupons are old, so probably won’t work)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – ToolkitRC WM150 150A 50V RC Watt Meter Power Analyzer [EU] ($-3)
Price history and price alert
Here is price history (for all/most countries) for ToolkitRC WM150 150A 50V RC Watt Meter Power Analyzer. The lowest price was: $19.99.
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)).