Can I suggest calling cat rescues groups that might take in FIV cats? I know some do. On Monday, when I am at work, I can ask one of our cat rescue groups. SHe knows of a organization that takes in cats that have FIV.
Also have you checked on the internet? I am sure there are lots of agencys that take in special needs cats that have FIV..just be sure to do your research on them..before going ahead.