I bought several one gallons from Adam at Flying Fox Fruits ( www.FlyingFoxFruits.com
) last year and 3 are now blooming and setting fruit.
Good prices and nice quality too.
You can email him and order direst or buy them off of eBay.
Mine have been cooped up in my greenhouse over the winter... so I have been hand pollinating with an artists brush.
Did the same thing with my Cherry of the Rio Grandes and Surinam Cherries. They all set fruit.
Now that the weather has warmed up I will move them outside and let the bees do the work.