call an independent towing company and tell them you need a flatbed tow to move a shed. The flatbeds have a winch on them. They just back in hook it up and slide it onto the flatbed. Take it to your place and anchor the shed with a rope or chain to a tree or other SOLID object and the tow truck pulls forward and there you have your shed.
Most of the sheds have "skids" under them - usually 4x4 or 4x6's you may need to put some lag bolts in them to attach the winch chain
Thats what I did! It cost me $50 cash to move the shed 8 miles...it was a deal
alot of sheds are built in panels and can be disassembled in 30 minutes, then you can move the individual panels by pickup truck or trailor and reassemble them at home in an hour, this also makes positioning the shed in your yard easier.