You could try contacting area rescues to see if they have or know about any cuy. They may have some in their rescue that they don't list since they are so hard to place. Don't cuy do okay with regular guinea pigs? I'm not sure.
ETA: I just saw a post by CavyHouse on another thread. She stated:
"I've had a lot of luck too placing cuys with non-cuys. It did seem to calm a lot of them."