Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. I found coupon for you. Check this out.
Link: Banggood product page
Coupon (86.47 USD): BG589b2e
(CouponsFromChina.com tip: you should apply the coupon in your 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): Bgdc9ebe, 00c906, BGc51ec6, BGe732df, BG00c906, BGHU1573, ADMITAD2212, BGGizchinak, 2022ACTIESNL, BGAlerabat1, Terence, 2203ActiesNL, BG1efeb0
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Here is price history (for all/most countries) for HOTO 150PSI 2500mAh Electric Air Pump QWCQB001.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).