Please also try this site that I run,
Adopt a Guinea Pig in PA/NJ/NY/WV . It's a site for guinea pig adoption in NY,PA,NJ, and WV. I also run another site,
Adopt a Guinea Pig in VA/MD/DC , for MD/DC/VA . I cull my listings from Petfinder, Petharbor, shelter and rescue webites, Guinea Pig Adoption Network, Guinea Pig Home, Craigslist, and other sources, so it's pretty convenient. Just search by state using the labels on the sidebar.