The bullet bubble burst long ago...You’re not looking very hard.
I look at several stores a few times a week.
When I have found any, it is boxes of 50 for $2.5~3.2/box. That has been limited to purchases of 2 boxes.
I’ve been able to purchase a couple boxes of 50 per month. That is all I find for the time I invest.
I have friends in our Houston area that find less than I do.
Congratulations with your success finding in your area. You could become quite wealthy using internet auction sites.