I personally have the IKEA detolf. It is quite big and you probably will need IKEA kallax too. It is both bad and good about the glass. It is bad because some hamsters may be scared by it's surroundings and it can be good because you can watch your hamster.
I don't know any pet shops around but if you choose to buy it online you can buy it at zooplus.
Great deals on small pet cages at zooplus: Alexander Small Pet Cage