Some people do seem to like to buy expensive stuff.
Why not this one for £7.50 or $12
I'm with Tim, I bought something similar for peanuts between rounds at a scale contest when my foot pump
broke, it just had to get me through 2 flights. About 10 years later it's still going strong!
My flight box has a 12 volt battery anyway for charging & pumping so the power supply is a no brainer. - John.