Help me mute a trumpet

[Blackstar]

Cheapest place for a trumpet mute anyone?
I'm about to destroy my little sister she's been 'practicing' for an hour. I support her and she is good at it but why does it have to be so loud .

 

[Blackstar]

smash the trumpet, then you can put up with crying for a good long period of time, heck beats a trumpet noise.

She wouldn't cry she'd beat the crap out of me

 

[Blackstar]

She doesn't really need it any other time just practicing, thanks for your post