Grocery shopping, too. Buy only when things are on sale and/or you have a coupon. I buy a lot of store brand items, unless there is a big taste preference or health benefit to a name brand. Things like rice, pasta, sauces, etc. I usually buy the store brand. I can keep my grocery bills down to under $200/month and I eat well and cook a lot. I rarely eat out because I enjoy cooking.
If you do that and buy in bulk when you can you'll save even more. We buy 5 lb bags of rice and stuff like that. I LOVE Costco!!!!