We bought a bike pump from Kmart for around $6. It's the standard looking 'stick' style pump with a tube that screws on to the tyre's valve.
It pumps up the tyres fine.
The problem we have is that when unscrewing it it seems to allow half of the pumped air to escape again.
What have people found to be the best cheap option?
EDITED TO ADD:
This looks like the kind of adapter required:
https://www.aliexpress.com/item/1005006025218600.html
I prefer clip on connector, but try unscrewing the pump from the 'tube' first, finger over end whilst unscrewing from valve
I've had an older version of this for ten years, just need to be careful not to bend at the base
https://www.bigw.com.au/product/repco-basic-floor-pump/p/743…
.