I would actually start with an aquarium, the largest you can.
I used these when I was young, with an open wire topper.
Inside I set a small igloo, a runny wheel, and a cup of food. Through the top, I inserted a water bottle.
As soon as you trust your hamster, if you're happy with the aquarium, you can buy a topper which secure on the top with clips. It will reach down with a ramp and your hamster can climb up one or two levels, depending on the size.
This is much cheaper than the regular hamster cage.
If not, then there are wire cages at PetsMart which are one/two/three levels and the doors lock securely that come with a wheel and house. These are cheaper than the habitrail things, and harder to break.