Hi (broken link removed)
I know this is a week old post, but I just wanted to say that if you want to adopt there are a lot of adoption websites. Have you tried Petfinder.com or some re-homing websites. Many of these websites list places like shelters that have guinea pigs to adopt, and some list people that need to re-home their pets because they can't keep them any longer.
Although I do think that breeders are not the best option, I don't think that it is right that every one is 'attacking' you about it. Lets just say that it is better to adopt because you are helping an animal that has suffered and are going to give it a new point of view on life.
But really if you think about it, I know that buying from pet stores and breeders supposedly 'motivates' these places to continue breeding animals, but if no one ever took these animals away from these places, they would have to die or be put down, and some one has to give this animals a better life than those small glass cages right?
Also some pet stores like some Petcos (or some other stores in your area) are actually ok with their animals. They even have adoption Saturdays, and Sundays so if you want to go check out the adoptable pigs in your area you should check out their websites for "adoptable critters weekends"
Good luck on your search!