After buying a Mettle DR-series monolight, J.L. Williams discovered it has an "FP" mode that can work with a camera's HSS system to sync at any shutter speed.
Promaster are now distributing the Dison Genius, a 250J monolight that can run on AA or camcorder batteries or mains power. The rebranded light is called the DuoLight 250.
Mettle have introduced a budget-priced IGBT monolight with flash durations as fast as 1/10,000 second. Promaster are selling the D400R for under $400 in the USA.