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.
only about $5
brand new can cost from around $1200 upwars, if you rent it new $800+ if you buy it used it can cost from $500+ and if you rent it used it can cost from $100+
A small Trombone.
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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.
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In a local music shop
it wouls cost about 699.99
it cost 10 $