Try the "prescription strength" antiperspirant. You will sweat much less.
It's more expensive, but you use less of it, so each container lasts longer. So it's not much more expensive in the long run by my experience. Especially if it saves you money on shirts.
It's more expensive, but you use less of it, so each container lasts longer. So it's not much more expensive in the long run by my experience. Especially if it saves you money on shirts.