A huge money saver for me has been meal planning. I plan all of our meals one week in advance (I used to do one month, but it depends on each household) and then make the shopping list from the meals I am going to cook that week. When I go to the grocery store, I only buy from the list - no impulse items :) Also, I do 75% of my shopping at Aldi. I don't know that there is one near you (Omaha maybe?), but even if it is a fair distance away, you could plan to shop once a month for the month. The other 25% I do at a discount chain store like Cub (Aldi's doesn't carry a few things that I need). I don't do coupons or "sale shopping" - I don't seem to have the time for that. However, I must be doing "OK" since I spend $300 or so a month on groceries and household products for a family of 6 :) When I started meal planning years ago, I used the $1/$3/$5 plan - spend $1 for breakfast, $3 for lunch and $5 for dinner - not per person, but per meal. I still use it and can pretty much stick to it. I will buy a ham for $9 at Aldi, but I can get 5 meals out of it between a ham dinner, a ham casserole, ham sandwiches, ham and cheese omelets and jambayla.
A couple of other "tricks" I have: I make my own laundry soap - it is cheap and works good. Go through your utilities/cable/phone etc and see if there are ways to cut back. I do the "budget plan" for my gas and electric and while that doesn't technically save money, it does help me plan my budget better since there are no peaks and valleys. I have combined my cell phone with other family members rather than each paying our own account. My cable is turned down to the "lowest setting," and here it is cheaper to bundle (don't know about your area). Think about using cloth diapers - even if you don't totally switch, you will still save money when you do use them (especially if you are using homemade laundry soap to wash them in). Shop your insurance (car and home/renters) around to see if you can get a better deal. Stop eating out - we NEVER eat out anymore and what a HUGE difference that makes.
As far as garage sales and stuff goes, I don't do those anymore either - I ended up buying more stuff that I didn't need than I did need! My kids do get alot of hand me downs between other family members and friends. We have a trading system between us so all the clothing gets passed around as much as possible. For new clothing, I shop at Kohls. Between the discounts, sales racks, coupons, and buying off season, I spend less than $200 a year on clothing (including shoes and outerwear) for everyone! I do have a Kohls card, but as soon as I make my purchase, I go straight to customer service and pay it off.
If you turn your budgeting into a "challenge" it can be fun to see how little money you can spend. To give yourself an incentive, start putting a little of the money you are saving each week into a jar for a special event! For me, the incentive has been to be debt free with $10,000 in savings - I own my home free and clear (4 bed/2 bath), have 1.5 yrs left on my car, have 1/2 of the money saved, and have ZERO credit card debt. You can do it too!
Good luck!