Should I get another guinea pig?

At first, I was going to get a betta fish, and the total cost came to $40. But then I remembered that guinea pigs at my local petco are $40. I already have 2 guinea pigs at the moment. Would you say it would be cheaper to get a guinea pig instead of a betta? Considering the fact that I already have the cage, (2... show more At first, I was going to get a betta fish, and the total cost came to $40. But then I remembered that guinea pigs at my local petco are $40. I already have 2 guinea pigs at the moment. Would you say it would be cheaper to get a guinea pig instead of a betta? Considering the fact that I already have the cage, (2 Midwest attached together) and I already have done research with guinea pigs, I think it would be. What do you guys think?

Thanks for answering if you do! :)
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