Other good sources of vintage air: old tires, boxes in attics, foot lockers. Mine shafts often have lots of vintage air, but keep away, you can get Black Tone Chamber Disease. Keep away from shipyards, airports, etc, this is how you get cheap imported air. If you can't find good vintage air, at least grab some quality American-made air from above an apple pie or from on the open range. If you really want some deluxe tone air, you can find small amounts of the really good stuff at the top of old bottles of wine. Place the body face-down on the wine bottle, with the mouth of the bottle in a tone chamber. Then drill a very fine hole through the side of the glass bottle and use a hypodermic needle of water to CAREFULLY fill the bottle to the brim, forcing the vintage air up into the body. Then you can discard the wine and bottle. I recommend a 1935, an excellent year for wine air.