Pet shops and branches use rodent mills ( a rodent mill is a place where money is the number 1. Priority and they over breed hamster till death and the pet shops then carries  on the abuse ) by teaching their new owners a wrong care and selling cages to small and less than 4x under the minimum size for a happy healthy hamster and it’s not just cages , food , bedding , hamster exercise methods , unsafe food and toys , not changing water enough, unsafe sand and Dangerous cleaning products and the amount of times per week/month you should clean the cages it’s time  to put this to an end and make a change I’ve tried so many other ways and the won’t listen to me so maybe they will listen to all of us