[cypher]

You can buy ready made shelves but I find it easier to make my own to fit whatever space I need it for, just use a piece of ham safe wood cut to the size you want & wooden dowels glued on with non toxic glue for legs. I buy 10 or 15cm dowels from ebay but if you can saw straight which I can’t just get longer ones & cut to size.
You can also use a hamster house as a shelf if it’s big enough to fit the wheel on top.