Finding your model with a cheap way
You can offer people a free fotoshoot. It is a good idea to advertise on internet or papers that you give a free fotoshoot with the condition to sign a model release. Be sure you explain good for what the images will be used and what exactly is written on the release. Much people will be happy to get a free shoot.
I wish you succes with finding your models.
Photo credits: Medaphoto.