DontRunMeOver

Most things that are hard and hollow or wooden (or both) can be used as percussion instruments. Any kind of bin, deoderant can, glasses case, door, banister, table etc. can have decent acoustic properties so try it out.

Although they're not acoustic, you can get really cheap keyboards which are fine for playing tacky melodies on and can also give you some really lo-fi drum beats. I recommend the 'bossa-nova' button.

Xylophones/glocks/marimbas are all more expensive aren't they?

Oh! You can fill up bottles to different heights and then blow in them or tap them to make different pitches.

I'll think of some more later.

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