the cheaper grocery stores is a great idea for the basic foodstuffs. I recently had to furnish my own apartment from scratch, and shopping at thrift stores saved me a bundle.
Probably lots of things -- cook at home instead of eating out, rent movies instead of going to theaters, use coupons and go to sales at stores instead of just buying whatever you want, etc.
four days we eat healthy and on a friday we eat fish fingers and chips or burgers and chips. on a saturday and sunday him and his kids eat at his parents. shower instead of taking a bath. buy in bulk. write a shopping list and stick to it. dont buy snacks, because it costs money.
Usually the small things make the biggest difference, like:<br />
Stoping eating out.<br />
Take your own lunch to work with you.<br />
Walk to as many places as you can to save money on petrol or bus fares.<br />
Only buy yourself clothes if you REALLY need them.<br />
Cut back on vices, like drinking, smoking or anything else. (it will improve your health too).<br />
Set yourself a weekly budget, and stick to it!<br />
Shop at cheaper grocery stores.
Technically you could cut back on everything.<br />
If I have no idea how you live though, so answering this is kind of hard if you want something specific.
Cook at home instead of eating out and pack your meals for work. Shop sales and use coupons; if a store offers you their free discount "card," sign up for it. Check retailmenot.com for coupons on all kind of merchants. If you have a cell phone consider cancelling your landline, and cancel any utilities you don't really use or need... like premium cable or anything like that. And don't do any impulse shopping... before you buy ask yourself if you really need it right now or not. Good luck :)
Keep track of what you spend, and it might become easier to see where you could cut back. I like the web site mint.com. It's free, and you can use it to track all of your finances (similar to Quicken, and I think it is actually owned by them.)<br />
Coupons can also save you a lot of money. There was a great blog series a while back by a man who was able to feed himself for $1 a day for a full month. It's a real eye-opener: http://www.grocerycouponguide.com/articles/eating-well-on-1-a-day/
I agree with TheHypocrite.<br />
But one thing I've found to cost a lot of money is eating out at restaurants/fast food places.