DX have just added a red XP LED drop-in module that fits the SKU 20333 torch
So $9.90 for the torch plus $8.34 for the 5-mode 90 lumen red module and you get Hi 90-Lumen, Mid 60-Lumen, Lo 20-Lumen, Fast Strobe 80-Lumen and SOS 80-Lumen plus the original module as a spare.
$18.24 (plus an 18650 cell that most people already have) seems pretty good value to me.