I am not sure what the average for that is in your area, but in Atlanta I can get the sewer line snaked along with a camera for $150.

is this on Snake Road?

Little to no money down is snake oil sales hype.

Don't fall for any no money down snake oil sales pitches.

So I send someone out to snake it and 3 or 4 months later it's backing up again.

I've got a property that needs a good snake due to roots in the main line.  

I have a truck bed tool box, and aside from having a tool bag (separate) that has most any hand tool you could need, the box has spare fuses, a plumbing snake, rubber boots for a wet basement, a drill & saw, a little bit of wire, etc.

But I also have no issue with calling a plumber (or even RotoRooter) to handle a clog if I either know it's something I won't be able to fix (I don't do plumbing snakes) or if I'm unavailable.  

What a snake! 

He snaked the camera in the water line and saw tree roots.