I never thought of the shelter as being too stressful for them, but I guess your right. We did have a dog though, and he would bark and stuff and they seemed fine with it.
I emailed the animal hospital (vet) that we go to and asked if they take in unwanted pets or have any suggestions of where I should bring them and that a shelter might be too stressful for them. Hopefully they will answer soon.
We were going to put an ad in the paper, but that was too expensive.