The whole map of the hobby: reputable breeders, rescues, classifieds and stores. Meet locally, never ship, and always ask to see the piggy first.
The national club. Their member list is the best way to find reputable long-hair breeders.
Shows and clubs near you, where breeders gather and you can meet piggies in person.
Search adoptable guinea pigs by ZIP code. Adopting saves a life and often includes a health check.
Dedicated cavy rescues screen for health and temperament, worth a look before buying.
The main classifieds site where guinea pigs actually change hands. Meet locally, never ship.
Regional guinea pig and rehoming groups. (Facebook Marketplace itself bans animal sales.)
Handy for supplies, but for a healthy long-hair we prefer a breeder or rescue you can talk to.