I'm, by no means, a guinea pig expert, but I have a tad bit of experience.
I have always heard that C&C cages are wonderful for piggies. I helped the new owners of my former two piggies(re-homed for their happiness) build one, and I have never seen happier pigs! Overall, its very inexpensive.
If anything, you can read through the link above to get an idea for a cage.
Hope I was of some help.
Good luck!
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