Bottled water! It's been a revelation. I invested in a filtered water bottle (Brita, around $7 at any large grocery store where they keep the water filters) and now I can drink water literally from anywhere without worrying about it. Replacing the filter every few months costs about as much as 1 bottle of water. And it fits in my purse - they come in different sizes. It's also so much easier to drink the daily recommended amount of water with this bottle. And, feeling a little more like a superhero by saving the environment isn't so bad either.

I had a light bulb come on watching a show about coupon use. So one day I saw 4 coupons for 40 cents off Soft Soap and said ok that is something I use everyday, I'll try it out. Using 4 coupons for hand pumps and I bought 4. I checked out paying only 9 cents per bottle, the store had doubled the coupons and the item was on sale for 89 cents. I now use coupons whenever possible -- it's free money -- like a matching savings account.

I bike to work whenever possible! If I bike 5 days a week, I save $22.50 by not taking the train. That's a potential savings of $90 a month.

Coffee - I now make it at home instead of buying out. Same for lunch - I bring lunch instead of buying. It actually saves both money and calories, so that's a win-win. Once in a while I still do treat myself so I don't feel like I'm missing out, but I try to bring from home 4 out of 5 days.

I haven't gotten my hair cut/colored in 10 months. I know that might be a bit drastic for some... but think of what it has saved me!

You can pretty much find coupons for everything from food to restaurants. I try to use coupons whenever I can, and I also shop at stores like Aldi, Save-A-Lot, and Bottom Dollar. I know my prices on family favorites, so I know what I can get away with buying generic to save or if I must buy brand name using coupons.
I also buy my husband tshirts from Goodwill, I find all kinds of neat college sports tshirts in excellent shape for $4. For my son, I always check clearance racks at the end of the season, and get huge discounts on his winter clothes, summer clothes, etc. for next year, when he will be taller and a size bigger.