Some animal shelters aren't listed on petfinder. You can call or visit your local shelters. Many don't advertise their exotics.
There are a few ads under petfinder classifieds, like:
Small & Furry:Guinea Pig
Cumberland,RI 401 658 3280 Jessica Cournoyer
peacefulwomyn@hotmail.com3-09-2007
Name: Ginger Age:Young Adult
Sex:F
Size:S
DeleteWe adopted Ginger from the pet store about 8 weeks ago. She had to be rehomed due to allergys in her previous family. She has been seen by my vet and has been given a clean bill of health. She is loving and adorable. She squeeks for food in the morning and is happy to be held! But my husband has developed an allergic reaction. She is a longer haired Guinea so allergies can be quite an issue. I need to rehome her. But I will only want to do so to a family who is SURE that they are NOT allergic as this will be her 3rd home and I hope it is her final home. I do not know how she would react to another pig but we were planning on trying to get her a bonding mate so she may be happy with another female or a neutered male. An adoption fee of $25 would be great. I also have her starter cage, water bottle and a 5 pound bag of food available , all for $10 if you need that.