I would suggest that you ask your vet to prescribe the oral meds but they are expensive and you are already strapped. If they can stop the spread faster though, it might be less expensive than it spreading. Do you have the three infected ones in isolation? You must be concerned that the three that are to be spayed/neutered in a few weeks don't get it. I lay in bed this morning thinking about all the money pouring out of me into this cat and that and wondering what I was doing, and the conclusion I reached was that I wasn't sorry for any of it, I've done what I felt I needed to do and I'll cope with the consequences.

Edited to respond to Catty1's post. I'm going to Bartells pharmacy soon to look at different gloves. I know I need to buy some cotton ones that I can wear in this room so that I don't have to wash my hands every time I come in and leave. I don't usually have a reaction to latex, only when my hands are getting chapped from washing and I have to have gloves on long enough for my hands to get damp inside. The Kiss My Face hand cream I've been using doesn't seem to help at all so I've switched to pure aloe vera. At night, I wake up every few hours with my hands burning and itching like crazy and find that I'm scratching them in my sleep - so I'll wear gloves at night.