Or if you are handy with tools, you could consider building yourself a cheaper version of the "professional" cages with the sliding doors in front and a closed top. I have one that I bought for a song, that's basically an aquariumlike acrylic box with sliding doors in front. Wood could be used to frame the acrylic. You could build something like that for probably 1/3 the cost of the high end cages, and it really does the same thing.