Around here, middle class has about the best deals and the most stuff, along with a large variety of stuff.
The upper class....mostly junk stuff. Hardly ever any tools because they hire things done. Lots of used clothes though if one is into that.
Sometimes you can get great deals from sales in the lower class neighborhoods. It seems that they always need some money, so they will sell whatever they have and you can usually negotiate a way lower price on an little more of an expensive item. But, what I have also found is that some of the stuff in the lower class 'hoods is that some of it may be a little warm to the touch. Don't get me wrong, I'm not stereotyping, but am going on just what I have witnessed from where I grew up and some of the ones I have known from school and later. If you don't have a job, haven't worked in years, and are on welfare, you won't be selling brand new, brand name tools, or any brand new garage items for that matter.
If your town has yearly cleanup days, you can get some good stuff there. My hometown used to have one week to get anything they wanted to get rid of, and set it out to the curb to be picked up. They didn't care what it was as long as there were no paints, or chemicals of any type. No car batteries, but you could toss tires. People from everywhere would be driving around and loading up. Almost every house on the street the wife and I lives on, had basically what amounted to a single axle dumptruck load piles in the front of almost every house. We got some nice folding chairs for outdoors one year, a few shelves, some lights. The doctor that lived a few houses down from us, his wife drove a Mercedes 450SL, and we saw her go by, had the top down and stuffed piled in tight where she was out curbside shopping

The city stopped doing it a few years ago due to the economy. The town we live in now was doing it, but all they were doing was dropping off a large rolloff container for a complete city block

No fun shopping that way.