Acebeam is offering the xp-l 6000 K version of the H40 AA/14500 headlamp on Amazon US for $25 until 5:30 pm EDT 28 Apr 19. For those not familiar with it, here are a couple of BLF reviews:
https://budgetlightforum.com/t/-/56061
https://budgetlightforum.com/t/-/55893
https://budgetlightforum.com/t/-/54472
It comes in a SST-20 95-CRI version, but it is NOT on sale. I own the SST-20 version and like it for close-quarters indoor work. (However, the flashing at the top and bottom of the ramp cycle is annoying.) FWIW, I prefer the higher-lumen (albeit lower-CRI), higher-capacity, 18650-driven SkilHunt H03 for outdoor work.