I have no idea the science behind maple syruping, but I do know the best maple syrup comes from places that endure horribly cold winters, sooo ... I think I'd rather order it from afar myself.
We raise chicken here at our house, so we trade fresh eggs for syrup when it is in season.
I think those sugar houses I provided links to above sell online. I have had gift baskets from Parker's sent to my brother in Jacksonville FL, and they are highly respected here in NH.