My current favorite AAA light is the Smiling Shark SS-5039.
It is not as bright as some, but I plan to mod several. I am bored with cylindrical AAA lights. Should come out under $10 with XP-G and boost driver. The head of # 14 above looks similar. I also like SK-58s, # 15 above. I have a Smiling Shark light that looks like # 18. I also have a Smiling Shark light like # 9; it is nice but I haven’t really needed it.
Added: My thread on my Smiling Shark SS-5039 mods. Smiling Shark SS-5039 1 x AAA size flashlight, modification notes, Now 3 x 7135 with modes, on a BLF Tiny 10 board.. I am up to 0.7 A in an XP-G2, on a 10440, for less than $10.