Sure you can buy an overpriced, small cage for your cavy from a pet store, or you can save a bundle of money and make your own! Here are my picks for the best homemade guinea pig cage sites.
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Instructions on how to make your own cubes and coroplast cavy cages.
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Guinea Pig Compendium
Several different cavy cage ideas including a homemade hutch, a cage using a child's wading pool, and more.
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Another site showing the plastic cube design but with great instructions and design photos.