You're looking for a cage that has at least 450 square inch space minimum as well as at least 15cm depth of burrowing. (preferred by most famous hamster youtubers I watch and what I go off. But you can have 10cm depth if you can find a tall enough tray cage).
You can buy a box for like £12 and make a bin cage, you can get a decent box from the Range. The trouble is there's only a few select cages suitable enough for hamsters.
I got a £60 box from homebase that's 709 square inch space, but you need to put in the time and effort to make it suitable though and do the mesh and zipties or however you wish to fit it on. Cages can amount up to even more than £60 for like 100 and something sq inch. Bargain if you can make a DIY cage.
The pictures I have here are ever so lightly outdated since he now has a toilet tray (instead of that massive green thing) and a trixie wooden wheel.
