Check the organic/natural isle of your grocery store and look for the Potassium Alum based deodorant. They look like a block of crystal. They’re natural and non-aluminum. They also come in unscented variants. Best of all, they’re cheap.
I have one, they’re super great astringents for stopping bleeding of small cuts :D sadly they’re not very effective on my level of sweat/stink 😭 though they are better than nothing so I use mine as a backup when I’ve run out of aluminum chlorohydtate antiperspirant. They are indeed cheap if you know where to look, and I’ve never had one run out (I just drop them and they break 😂)
of note, potassium alum / any alum mineral does actually contain aluminum ions by definition. they are known to be non-irritating to some people who have a reaction to more mainstream antiperspirant ingredients (e.g. aluminum chlorohydrate, aluminum chloride) hence their popularity as an alternative
me spending a bunch of time and money to find and buy unscented stuff:

Just put this liquid aluminium smelling like asphalt and excavator under your arms, bro
Check the organic/natural isle of your grocery store and look for the Potassium Alum based deodorant. They look like a block of crystal. They’re natural and non-aluminum. They also come in unscented variants. Best of all, they’re cheap.
I have one, they’re super great astringents for stopping bleeding of small cuts :D sadly they’re not very effective on my level of sweat/stink 😭 though they are better than nothing so I use mine as a backup when I’ve run out of aluminum chlorohydtate antiperspirant. They are indeed cheap if you know where to look, and I’ve never had one run out (I just drop them and they break 😂)
of note, potassium alum / any alum mineral does actually contain aluminum ions by definition. they are known to be non-irritating to some people who have a reaction to more mainstream antiperspirant ingredients (e.g. aluminum chlorohydrate, aluminum chloride) hence their popularity as an alternative