Hi Brittney,
I found a pic on a German web site about an idea how to build hamster cages.
http://berg.heim.at/almwiesen/411543....htm#Selbstbau
It is not suitable for household with cats or other animals who could get into the cage. If you like it, you can ask me about details. You could put the cages on shelves.
Another option would be to take spacious rabbit cages and put hardware cloth around the bars so that the lil´ones can´t walk through. Sometims shelters need to get rid of cages that people dump with their rabbits, guinea bigs and give them away for free or for a donation. Since there is no problem with air circulation you could put them on each other if they have a side door.