Okay, thanks!
The best place is with the help of a rescue shelter if you have access to one.
The guides below offer more information on adopting, and other guides for potential/new owners
Rescues (Adoption and Dating), Shops, Breeders or Online? - What to consider when getting guinea pigs
Are Guinea Pigs For Me? - Wannabe Owners' Helpful Information
Getting Started - Essential Information for New Owners