Aside from the Steamlight Propolymer, which is pretty old, I can't think of any.
Duracell has a 4AA version of their Daylite series.
Since the forward voltage [Vf] of most power LEDs is above 3.0v, it is more efficient if the power source above that voltage and doesn't have to be boosted by a boost circuit. Three cells may work if they are fresh, but even three fresh NiMH rechargeables will only be 3.6v, which may not be enough. Four is the minimum to guarantee a voltage under load that is above the voltage forward of many power LEDs.What the reason in a flashlight on 4*AA? Maybe better think about 18650. :thinking: