It only costs about $180 dollars to install a 30 amp circuit in you home. You can then run 4-5 s9s off of that.
Is it really that cheap to run a 30 amp circuit? What about rewiring for the outlet?
Honestly it's hard to estimate a price for all environments and areas of the country. But I would imagine if all that needed to be done was run some wire and an outlet then yeah it wouldn't be too much. **But** everyone's house/building/shed is different so just use it as a very rough guide.