Aliexpress
Here are coupons that you can use.
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – RAINPOINT Water Flow Meter [EU] (-3 USD)
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (25.19 USD): BG23ALEAprD
Coupon (26.31 USD): BG589b2e
(CouponsFromChina.com tip: 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
Old coupons (from the oldest to the newest): BGMX284, BG3c8551, BGJUNEGSG9, BG7b9c94, BGea947e, BGHUXC107, BGbfe0b4, BG1ccfe0, BG56f78b, BG21a258, BG8d94e7, Cuponation9, BG2d7e03, BGce49c8, BG0aac08, 9OFFSUMMER, BGbcb244, BG88aceb, BG1175b3, BG8ReviTrage, BG00c906, BGdbe184, BGae4373, BGf625a4, BG41da4f
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – RAINPOINT Water Flow Meter [EU] (-3 USD)
Price history and price alert
Price history (for all/most countries) for RAINPOINT Water Flow Meter is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).