As of 2014, male and female guinea pigs are available at most any neighborhood pet store for approximately $32.99 to $37.99, according to PetSmart, though pricing may vary by location. Availability is seasonal and state and local regulations also vary.
According to PetSmart, guinea pigs may be kept alone or with a same-gender companion in a well-ventilated home equipped with plenty of space for a food dish, water bottle, hiding areas and other accessories. Since guinea pigs are unable to manufacture vitamin C, a supplement must be added to their water every day. The front teeth of guinea pigs continuously grow, so they also need healthy treat sticks for chewing.