Originally Posted by
Baritone73
For a very recent data point: I flew into REP this morning and went for the VOA. Upon hearing that I had no photos with me, the agent told me "You pay one dollar." I paid the "fine" (exact change) and had my visa about two minutes later. No hassle -- and it probably cost less than the photo would have.
You can pick up a batch of photos in Cambodia for $1 for 4.
Not that it is in any way of help to someone on the visa line at the airport.