Sticks, as much as you can put in it. Willow, aspen, birch, apple, are all fine but if you don't know google woods suitable for birds/hamsters. Wash well with soap and salt if you can, and hang up to dry. Once they are dry you can use them for a long time.

Coconuts are great.

Hay nests like this : https://www.amazon.de/Trixie-6108-Grasnest-f%C3%BCr-Hamster/dp/B0009586MU/ref=sr_1_36?__mk_de_DE=%C3%85M%C3%85%C5%BD%C3%95%C3%91&keywords=trixie+hamster&qid=1571102738&sr=8-36

are very versatile. You can pierce them with sticks and place them very high in the enclosure. On the bedding level the mice will absolutely destroy it, very fast, won't last a month. High up they won't destroy it. They'll sleep in it. But destruction is fun so since it's so cheap maybe buy a few of them.

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Willow balls are also their absolute favorite. You can make them yourself, but buying is so much easier. If you can craft with willow, your options are limitless. People make all kinds of stuff with it.

Hay. Giving them plenty of hay makes them busy. They love building nests and they love darting in to the hay. It's fun to look for eatable things from the hay too.

You can also collect and dry wild flowers and plants, which you know are non toxic for mice, but the season might be over with already.

Rocks, safe rocks are a different type of texture to study. It also uses their nails well. Note that with rocks you must place them directly to the bottom. You can also use a brick, for that look up what kind of bricks gerbil owners use.

And all the things other people already told you to get.

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