For those of you who still use cash I really recommend saving all of your change and 5 dollar bills. It honestly adds up so fast. Ive been doing this for about a year now and Ive saved around 400 dollars this way. Its a nice rainy day fund.
I have an old fest beer glass that I put all my loose change in and cash it in when it's almost full. It adds up to a lot. I also saw your other post about not trying to use your credit/debit card as much and so am I! I feel like I spend much more money when I use my debit card and I always hate going online and checking my account balance after I do, haha.