Lilyandluna, the minimum size cage a rabbit can be in is a 4′ by 2′. As for which to get, there are many options! I personally have a store bought cage that 4′ by 2′! Even though my bunny seems to like it, I am very unhappy about it. Anyways, there are three different options I remember, maybe more. One, the cheapest, a dog pen. Dog pens are easy to clean and very storage friendly. The second option, which I do not recommend, is a dog crate. Dog crates most often come in very small sizes, and the larger ones are very expensive! They are also very hard to clean because they only have doors on the sides. The third option, which I think I would definitely get, is a c and c cage! These cages are great because they can be built any way you want! If you can only afford to get a few, just enough for make 4′ by 2′, that’s ok! You could buy a little bit more every month and eventually, you’ll be able to build a whole three story condo! Of course, with all theses good things there needs to be a catch. This cage isn’t very cheap, especially if you want a condo. A condo will most likely cost more than 100, but if you get the cubes from Walmart to do a 4′ by 2′ then I think it would cost around 70$! But the price is definitely worth it!!! You can also get a hutch. But hutches are very very expensive and they don’t last long because they’re made of wood. And if course rabbits chew wood, as well as pee on it! Hope this helps! And remember, this is my opinion I’m sure other people may enjoy the things I don’t like. But in my opinion, you should get a c and c cage, but that’s up for you to decide! 