You can get Drillpro Electric Drill Dust Collector for $11.49 using coupon code (in Banggood). Just check coupons out (with price alert and history). Let’s see what best price is ATM.
Latest coupon code price check (UTC time):
Weight 38g, Produce Name Electric hammer dust cover, Color Blue, Size 88x 50x 44mm, Material Dustproof sponge + PVC + PP plastic
Banggood ($11.49)
Banggood warehouse is located in China. There is no active coupon in my database right now (for Banggood). Is it cheap? From what I can see this price is higher than average price ($9.60).
Link: Banggood product page
Price: $11.49
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGa289b6, BGDRB18
(there’s a little possibility that old coupon will work)
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
Here is price history (for all/most countries) for Drillpro Electric Drill Dust Collector.
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)).