You could try posting ads at local nursing schools that produce RNs, LPNs, CNAs, or even Respiratory Therapists. I know some families have advertised through Craigslist, Monster, and the local newspapers. Families seem to have success when posting advertisements at local schools for nursing volunteers. Some RN students were CNAs and would like to volunteer to get experience, and references for future employment.
My co-worker and her family have done this, and she has received requests for volunteer work with a family member in need of healthcare. Its actually worked out very well. She has 3-4 student RN volunteers (who have their CNAs) who come in throughout the week and assist the family with patient care. One of the volunteers has already graduated with her RN and still comes twice a month to provide respite care for the family. She continues to volunteer her services. In this economy, you may get many volunteer requests!
Please let us know how this works out!