They are only in Tucson. 4 deck games in Phoenix.
At one point early in my career I played 1, 2, 3, 4, 5, 6, 7, and 8 deck games within the span of a month. I've only seen the 7 deck game once and I'm not sure if it still exists. There are plenty of the others still in existence though definitely 3 and 5 deck are fairly rare with 4 deck being much less rare.