Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (51.23 USD): BGc363fd
Coupon (55.36 USD): BG00c906
(CouponsFromChina.com tip: apply code in your basket (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): BG902, BGOD1, AFfbG10, BGtravel305, BGDQ2089, BGOS19, 502C6B, BGBFAFF2019, BGCITYADS2019, BGTS204, FBCOUPON1, BGAFF10OFF, bGhOnEy10, BGdragonBoat, BGCAMP01, bgshOOp10, BgcLuBofErtA10, BGZPBC15, BGTY704CP, BGCuponation10, BG10OFFAFF, BGwhielabel, BG0b82e2, BG9a9fa, 13f142, BGP7710, BG10OFFAFF1, BGf735c2, BG4d9120, BGAlerabatod, BG7280ff, BG1efeb0, BG36e006, MVC8SPRING, 8BGwbg2204, tRaDetRaCKeR, BG2bb7a1, BG5d2ea4, Cuponation9, BG073996
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Price history (for all/most countries) for IPRee Portable USB Shower Water Pump is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).