1xAA Convoy T3, Lumintop Tool 2.0, Thrunite Saber, and many others
2xAA Wurkkos WK05, Convoy T4 (nice but is on the big heavy side)
I'd avoid electronic switches and lights that aren't compatible with Alkalines in a pinch, (but don't use Alkalines!)
These aren't as sophisticated as Emisar...