Gotta Get A Goat

I want a goat. No, I am not joking. I want a goat. Or two or three. 

I have a fenced back yard that is about half an acre. I am a single mom trying to keep the grass cut (which really means paying to keep the grass cut) and nobody uses that part of the yard for anything. Goats would keep the grass trimmed and, as a bonus, we can have fresh goat milk. I would absolutely love to learn to make goat cheese, too!

I've never owned a goat, although my uncle used to keep them. Having no idea where to actually find a goat, I looked (don't laugh) on Facebook. I went to the fan pages of several local farms and found a single goat for sale. It's a special purebred goat and the asking price is $400 obo! No, no, no. I am not entering these goats in the fair. I need a less expensive version! 

Where do I go now? Do you have goats? Do you have any advice for me?