If you are looking to get a guinea pig as a pet, the first thought to cross your mind would be to go to the pet store. But WAIT...
Did you know that there are rescues all over the United States that have guinea pigs available for adoption? Not only that but there are many places you can get them.
Rescues just for Guinea Pigs
Humane Societies- chances are you won't find them on their website
Craigslist- in your area, go to Community, then Pets and search
The point is there are guinea pigs all over that need you to adopt them. And more specifically you don't want to adopt from the pet store. Often times they come already pregnant, sick, inbred, etc. While it is tempting because you feel bad for them, the only way pet stores will stop breeding and selling them is to make them lose money doing it.
Why should they stop selling them? First of all they don't take care of them well at all. Many come with pieces of their ears missing, sicknesses spread easily, males and females mate and come pregnant, etc. I've been in way too many places that have too many pics in one area, including the federal requirements. Some may infect pigs you have at home, or they have parasites or mange. Last but not least they are often mis-sexed, where you are sold a male thinking it is a female.
Another thing people don't realize is that the staff at pet stores are often not educated as to what is good for the animal. Many times people are sold cedar bedding as a good option, which can make your pig very sick. Store employees also offer treats, and food that unnecessary. For instance you see Huge Balls for Guinea pigs at the store, for them to run in them around the house like a hamster. Guess what? Those are bad for their back bones...
Research as to what is best for your pet should only be done by you, read from sources you trust. And do not buy your guinea pig from a pet store when you think: Where Can I Buy A Guinea Pig for A Pet?