BTW, here's a pro tip for gaming the system on free shipping at Aircraft Spruce. Develop a list of items you're going to need at some point in your build, both high-cost and low (parts, tools, avionics, etc.), but don't order them all at once. Instead, put them in a Wish List and add them to your cart for purchase one at a time, as needed to get each order over the $350 threshold for free shipping. You can save a lot on shipping over the course of a build by ordering this way.