That depends on what item you want.
How many tokens have you got? If you have 20 of them, you can get an armour especially for bards, but if you don't play with one, it's useless to you. In that case I would suggest throwing in either 4x5 tokens, 2x10, 1x15 and 1x5 or any other combination that you can think of.
If you throw in 5, 10, or 15, you get different kinds of boots (I believe with 15 you get Boots of Speed)
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