You can get ROCKBROS Mini Electric Air Pump 100PSI for $46.99 with coupon (from Banggood). Just check coupons out (with price alert and history). What is the best price?
ROCKBROS Mini Electric Air Pump 100PSI Inflation Power One-touch Operation Waterproof Type-C Fast Charging Portable Bicycle Pump
Latest price update (UTC time):
Banggood ($46.99)
Banggood warehouse is located in China. There are no active coupons for this product, but the price is pretty low isn’t it? But wait a sec… Is it a good price?
Link: Banggood product page
Price: $46.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGTYMAR62
(I don’t think these’re gonna work, but you can try ’em out anyway)
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Check out price history chart (for all/most countries) for ROCKBROS Mini Electric Air Pump 100PSI.
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)).