Photography for minuscule budget

So to begin with, let me give you an idea of budget. We were originally just going to do a courthouse wedding because we are not wealthy by any means, and I am not very high maintenance when it comes to things like this. I couldn't care less if it was in a courthouse or the Cistine Chapel, but my mom made a push for an actual ceremony. We found a venue that's only 200 and a selection of dresses that are about 300, both things my mother is paying for. A friend is officiating for us, the reception is a small and informal potluck with family and friends(plus a beautiful cake made by a local bakery) hosted at a friend's house, I'm making all the decor and floral arrangements myself, and the current plan is hopefully to hire another friend's dad to do the photography. However, I'm also trying to find a backup plan for if he's busy or too expensive. Only problem is that I've noticed most photographers cost more than my whole wedding thus far. What are some of the best places to look for photographers that stay below the four figure range? Or is there an alternative idea I can pursue? I just know there is no universe where I can scrape together even $1000 for photography, and I know the average is much more than that. But I also want at least pictures of the event, even if they're not mindblowingly good. It's just the one part of the wedding ceremony I can't do myself.