So.....flying to Breckenridge, CO with Parker on December 26th. He is on Oxygen and the Airlines require special Portable Oxygen Concentrators that Insurance does not cover. I was just quoted $600 to rent one. Does anyone know someone who works for a company that will rent a portable concentrator for a 6 year old child at a lower price? Or...for that matter, does anyone own one that we can borrow??????