Buy a water filter and take your own water to the gym or to sports. Bottled water is expensive, and disposing plastic bottles in to the garbage is bad for the environment
Master the thirty day rule. Whenever you’re considering making an unnecessary purchase, wait thirty days and then ask yourself if you still want that item.
Try generic brands of items you buy regularly. Instead of just picking up the usual brand of an item you buy, try out the store brand or generic version of the item
Before you purchase anything online, do a web search for the name of the store + coupon and see if anything comes up. You will be pleasantly surprised how many coupon codes are available online.
Organize a friend or relative or neighbor swap of clothes, toys, furniture, CDs, etc.
Create a menu of meals for the week before going to the grocery store. This way, you will avoid buying too much and know exactly what is needed for the week.
Shorten your gift list -- is it really necessary to buy everyone on your list a present? Consider sending a thoughtful holiday card or an e-mail, or even writing a family newsletter to update everyone about the past year.
Assess clothing in terms of quality as well as price. An inexpensive shirt or coat is a poor bargain if it wears out in less than a year. Consider fabric, stitching, washability, and other quality related factors in your selection of clothes.
Bring your own shopping bags -- many stores offer a few cents per bag discount if you bring your own bags, whether they are plastic or cloth!
Clean clothes inexpensively. Wash and iron clothes yourself. If you use a cleaner, compare prices at different establishments. A 50 cent difference in cleaning a shirt, for example, can add up to $100 a year.
When shopping online, see if they offer a "pick up at local store" option. This will allow you to price compare online, and not pay for shipping.
Use student or senior discounts to your advantage! You can often save hundreds of dollars!