Depends on what you mean by cheap. If $80/mo is in your range and you don't mind it being outdoors, there are several places. Various boat/trailer yards in Woodinville and Carnation.
If we're talking smallish, and/or open trailer, parked outdoors, you can probably park it at my house in Woodinville... next to my smallish open trailer. You might have to cross my wife's palm with a small amount of silver, though.