I started my business (and still run it) on equipment bought from people on craigslist.
First was a 42" Troy Bilt tractor riding mower(I didn't know any better). Right now it's on all flat tires and sitting a trailer that I don't use. It was hard to change gears from drive to reverse and the hood cover was/is damaged and is lopsided. *shakes head @ self*
Then I bought a 1993 Toro 36" walk-behind. It's a belt drive and old as hell. I had a bad wreck in July

and my Toro 36" was on the back of the truck, it flew off and landed upside down. The deck frame is bent.
the front right wheel isn't level, it's off the ground about 2 or 3 inches. I put it in my sisters garage and bout a 2003 Exmark 36" Hydro from a friend of a friend for $900.
Sorry I got off on a tangent.
I also have bought a stihl stick edger from a guy on craigslist. It cost me $170. I think it was worth it. Before I bought it I was edging with my Redmax string trimmer.... took way too long. And sometimes it just ain't practical to use the trimmer to edge when the grass has grown over the sidewalk 3 inches , they have a corner lot, its 4pm on the hottest day of the summer, somebody stole your hat with brim that goes all the way around, no water in truck, and the neighbors are sneakily looking out the blinds, positioning them just right so they can see out but you can't see in, you only notice they move slightly whenever you look up.... oh and you got on goggles but still keep getting hit in the eyeball with grass, pebbles, rocks, sand, twigs.....
*exhales*
good deals on craigslist, just gotta know what you're looking for (as far as condition) and what your budget is.