Here are some things I found that we used:
--leather couch and loveseat for $30
--electric lawn mower for $15. Sixteen years later we are still using it.
--children's books. I used to get all kinds of great books for my kids.
--children's clothes. Garage sales are especially great for finding baby clothes.
--Toys. I got all kinds of toys that I normally wouldn't have had the money to buy.
--motorcycle helmets. My husband wasn't thrilled with going with me until he saw these!
--camping gear. We have been able to help get camping gear for Boy Scouts who couldn't afford it.
Lastly, because we are in the Christmas season, I want to mention the "windmill" decoration I found at a garage sale. I think I paid $15 for it. Today I was in a store and saw one that is about 1/3 the size (mine is about 2 feet tall), for $100! Score! Here is a picture of what it looks like.
You put candles in those little metal cups, and the heat from the candles causes the windmill to turn. The figurines are set on wooden disks that rotate when the blades turn.
If you think you wouldn't buy things from garage sales or thrift stores, try going and you might change your mind!