My Opolar air duster from a previous ozb deal has been on the fritz for a long while only working for 2 seconds when fully charged, but works fine if left plugged in. I've been meaning to diagnose it for a while but there's not much information on the internet and when searching for a replacement I found this one that is not only an air duster but a vacuum also. For $30 I think it's potentially a really good deal, apart from the included USB to 9v barrel jack charger (I would have much rather USBC or micro USB so can use any cable and not a hard to replace charger if something goes wrong with it).
Camel x3 showing that this is the cheapest price: https://au.camelcamelcamel.com/product/B09FQCB9XB
These things are really good for cleaning dust out of electronics and the vacuum might make it useful for around the house too.
Video reviews:
1) https://www.youtube.com/watch?v=0n-GrakJC18
2) https://www.youtube.com/watch?v=67MKsGeGtQo
From one of the recent AU Amazon reviews. Canned air is what I would be looking to use it as a replacement for for PC, car, etc.