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A small Trombone.
cornet Clarinet and Trombone
Trombone are different for everyone so I recommend you go to a band shop and just try out their trombone and see what brand you like best.
In a local music shop
Depends on the trombone u want.....
Bach, Conn , and Shires are very exensive to buy if you want a proffesional, if you want small brands you could buy them for $100.