I have heard that you can buy compressors to fill your own tanks. I have never done this before so have no idea how to do this. Has anyone used compressors to fill their own tanks? How hard is it? What about these online stores where you can get air from? Has anyone tried filling their air from an online store? Lastly i have heard about a contraption that lets you fill your own air through your computer. Does anyone know anything about this?