One of the best ways to save money is to never spend your change. When a cashier asks for $7.25 don't toss that quarter their way. Give them $8.00 and take that 75 cents back and pocket it. Take it home and put it in a piggy bank.
Every time I get change back I just toss it in my purse, forget about it and then clean it out every other week or so. Once it is at the bottom of my bag I forget about it. The only time I really think about it is when I hear it jingle and it's nice to think about the money that I am putting away.
I know this isn't a way to save tons of money but I fill up a piggy bank a couple to 3 times a year and each time I have anywhere from $100 to $130. Think about that. With that money you could buy a new JSK or fill your closet with a new collection of socks.
Now, don't waste your money taking that jar of coins to the CoinStar. CoinStar charges you and takes part of your money that you so diligently saved. Hop on down to the bank and ask for coin wrappers. They give them away for free. Roll all of your money at home, take it to the bank, and get cash moneys.
There you go. It isn't magic but it is an easy way to save a little money. Make sure you put it to good use.