Somebody had PC Part Picker [1] on a different thread. Found it kind of helpful. 3x, 3.5x, and 4x is relatively common across most memory types. DDR4-3200 2x32GB is one of the few that appears to have flattened slightly at 2.5x, although most DDR4-3200 is not as severe as other DDR4 or DDR5. None of the other lines appear to have flattened significantly yet.

[1] https://pcpartpicker.com/trends/price/memory/