Call your local welding shop and see if they rent/lease tanks.
I don't own either of my tanks...I have security deposits on them instead, and just swap them for already filled ones. Saves me time, and I can always get my deposit back later on.
Primary: English Mild
On tap: Pale Ale, Lancelot's Wheat, English Brown Ale, Steam Beer, HoovNuts IPA
Bottled: MOAM, Braggot, Raspberry Melomel, Merlot, Apfelwein, Pyment, Sweet mead, Cabernet
Gal in 2009: 27, Gal in 2010: 34, Gal in 2011: 13, Gal in 2012: 10