The butterfly cage can be purchased or made at home. A commercial cage can be purchased at the cost of $7.58 at Walmart and has a volume of 0.13 cubic feet or purchased online for $10 with a volume of 3.4 cubic feet. A homemade cage can be made for just $2 and has the volume of 16 cubic feet. The homemade cage is bigger, cheaper, and disposable. However, making a cage is less convenient timewise. The purpose of the cage is to observe the birth and beauty of the butterflies before releasing them. It is possible just to tape the cup top containing the chrysalises to a tree limb.
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