Has an AFL game ever ended 123-99?
Exactly once. On April 8, 2000, Essendon beat Carlton 123-99, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 123-99 in league history.
That makes 123-99 the 3884th most common final score out of 6,649 that have ever occurred in AFL. One point away, 124-99 has happened 5 times and 123-100 has happened never.