Miracle Fruit Trees.
If you are looking for a real novelty fruit for the home garden, then the Miricle Fruit, (Synsepalum dulcificum) could be it.
You do not grow it for the the taste of the fruit, it is used for the quality of its small red berries that transform sour tasting fruits to sweet tasting on the palate.
As far as we know no named cultivars are available except for Hirsutus, and as the name suggests the foliage is hairy. Trees are mostly grown from seed, although you can propagate then from cuttings, the fruit is more of a novelty than anything else.
Miracle Fruit are available for sale from the following specialist nurseries.
GARDINO NURSERY Rare & Unusual Plants
Tropical plant nursery that specializing in a wide variety of rare and unusual plants. Shipping is available to retail and wholesale customers nationwide. Our site also contains lots of useful information on a variety of tropical plants (over 500 varieties) and a gardening guide.