My son bought a hamster cage for 2980 yen ($30.10 €22.24) at a do-it-yourself store Homac. It includes cage, feed box, sleeping house, sliders, 2nd floor, 3rd floor, water tank, and running wheel. It is for a golden hamster. My son does not have a hamster yet. He used to have Djungarian hamsters. But they lived for only one month, they died quickly. The reason of sudden deaths were unknown. Maybe our care was not good enough.
My son is planning to have a hamster again. He hopes this time they would live much longer.