I need a good single AAA light… something similar to olight i3s or itp a3.
It must have clip. No matter if reversible or not.
It must have low med high modes. No matter if it have strobe. No matter the mode order.
It must be lightweight so stainless steel is forbidden.
It must be the smallest possible.
It must have xpg or xpg2 led.
It must be well regulated.
It must be able to use 10440.
It must be less than 25usd $.
Foursevens Preon 1 is the first thing that comes to my mind. It is over your budget, but you might still be able to get it for $28 with the FOURTH -discount code (not including the possible shipping fee).
It is little slippery for a twisty light tho.
This doesn’t meet all of your criteria but for the price and seeing that you have all of those others small lights you may be interested in adding this to your collection. I have one on the way.
There is also a Crelant V01A clone, the UltraFire LZZ-06 for only $8.68. Colors available as well.
The width of the Crelant V01A / UltraFire LZZ-06 is a bit larger than other aaa/10440 lights though.