Debbie Hinchey found an informative web site: www.treesofantiquity.com. They are in California and sell organic fruit and/or trees.
Dan Elliott got the Grand Champion prize for the outdoor fruit with his beautiful apple collection – ten varieties, all named, sitting pretty in a basket!
Paul Larivierre had amazing blueberries, and said he keeps the pH down by watering with 1T. vinegar in his 1.75 gallon watering can. He also fertilized with ammonium sulfate in the spring and used a little aluminum sulfate later on, but the aluminum sulfate lowered the pH too much too fast.