If you are a bit handy, you can make some pretty amazing cage layouts from Sterilite storage containers (Walmart) and down-spout "tubing" (Home Depot). Just remember to drill ventilation holes in the sides and the top - or better yet, make a screen-lid. My Hedgehog had two giant tubs connected by a tube. One tub was paper shavings and the other was piles of T-shirts. This gave her multiple environments, plenty of places to explore and separate rooms for eating/sleeping/playing/running. Had less than $50 invested for a giant cage.
Happy to post a picture if this doesn't make sense.