The Bothell community fair isn't actually run by the board you're thinking of. I'm not sure which event you went to, but the board fair is usually a small neighborhood thing, not the big city one folks set up booths at. In my experience the $75 spots are at the bigger summer events where you get real foot traffic, so the price you paid sounds about right for a smaller gig. Your mileage may vary, but checking last year's numbers before paying is smart no matter which fair it is, since some of these events are mostly families and kids and not really shoppers.

My uncle did the same thing with his log for a landscaping crew, except he went the other way. Started with photos, then went back to a small notebook because he said scrolling through 200 pics of the same dirt pile drove him nuts. He ended up using a cheap voice recorder clipped to his shirt, just talked his way through the walk and typed it up at night. Took him maybe 20 minutes total and he never lost a note.