I can't get my tropical fruit seeds to you through customs.
You can find some interesting tropical seedlings/seeds from both
Horizon Herbs in Oregon & Richter's in Canada.
Sapote varieties will take around a decade to crop.
Nispero, a relative of the Sapote is quicker to crop.
Star Fruit will yield quick on short trunk - charming fruit, acidic taste.
Barbados Cherry yields quick & blender juice is good.
Neem is an extremely interesting useful tree you can prune.
Noni is well worth getting - see my " Need a Challenge?" post in Drought Forum.
Annon (a.ka. sugar apple?) & Mammon , both of the same family will prune
easily & bear custardy sweet fruit quick .
Pappaya will fruit inside a year - Aloha Seed has varieties.
Bija (Annato) is an easy one, aside from being coloring agent the fruit boiled
in milk treat internal bruising.
Jaropha you might recognize from bio-diesel promoters.
You might also like to seek out the rare African fruits.