$100 is a lot
There is this little issue that pops up on forums often and can be seen in politics as well, I call it “political disease” since I saw it get to anybody who was spending public money for longer then a few years, in contrast to spending money from a company of oneself.
It boils down to “it is very easy to spend others people money” and on forums it goes something like this.
OP, I want something for around $X that does this and that.
A reaction, well if you spend $X plus $Y it is just a little more but gives you these advantages.
Often followed by another’s, well now that you look at $X+$Y you really ought to consider adding $Z for then…
And so on, you get my drift.
OP asks for $100 zoomie.
He can get two Jaxman Z1 lights in different tints, or 3-4 Brinytes
These are very very nice zoomies, all that have handled a Z1 agree the quality is superb, the rattle free zooming action works like a charm. It outperforms a heavy big Uniquefire UF1504 easy and can be called compact for sure.
If OP insists on spending $100 I’d say:
Jaxman Z1 ~$50 (50 left)
Liitokala lii500 $20 (30 left)
2x Liitokala 26650 5000mAh $12 (18 left)
Either a 26650 non zooming light or:
Convoy S2+ $12 (6 left)
Decent 18650 cell (1-2 left, yay within $100 
)
Seems a lot more versatile with an extra cell to feed the Z1 on long missions, a secondary light and a good charger to keep track of the cells health AND within $100
Please show me a better spending of $100 without surpassing it with just $0,01