Current Wally World price is 23.95 plus 2.16 tax for total of $26.11 per Winchester White box 100 round box.
My cost to reload is around $11.18 per 100 rounds. Plated or lead bullets and buying bulk from online suppliers.
I don't even need my engineering degree to figure which is cheaper. (added bonus is tuned ammo and the fun of tinkering with loads!)
What do I do with 9mm brass? Try to find 'em. The range pixies hide 'em in the grass.
A lack of planning on your part does not necessarily constitute an emergency on my part.