I would check with your local Hardware, Home Improvement Store or Farm and Fleet. Yes, I'm sure Menards can help you out.
I prefer to have a tank so that the compressor only runs once in a while. Tankless models go vrroom, vrroom, vrroom, every time you actuate the brush. That would drive me nuts after a while. Unless you had enough hose to put it in another room or on the other side of the property.