This is a really good way to save money:
Don't shop at multiple stores for stuff. Stay in one place; buy everything there. And buy private store brand while you're at it, save more.
I bought toilet paper, toothbrush, toothpaste, shampoo, 2L cola, chips, cotton swabs, and mouthwash for less than $25.
If I was stupid, and bought name-brand, i would spend $55 on that stuff.
Enough of my rant; shop cheap, get a job, save your money.