100 gallon or larger water heater are typically in the thousands of dollars due to the required BTU to heat up the water. They are also meant to be pressurized.
http://peggylayton.net/ccp0-prodshow/02.html
http://www.thereadystore.com/water-s...ncy-water-tank
The best price I found is through a guy out of Utah for $360. His number is 801-458-5271.
Ours are being setup in the attic of my garage on top of its own metal frame. Sprinkler system uses electric pump (thats what I meant without the plumbing part). The picture I posted is for 180 gallon I think.. The actual container is posted on another thread :"she got prepper bug." Oh make sure you measure your doors... ours are in the garage for that reason! We also have to finish and insulate the garage and in the middle of installing a sky light for winter season.