They do not ship, but maybe you can ASK them if they will make an exeption. They are located in Miami. They specialize in Kohala variety, but if you scroll down a little they have the Biew Kiew Longan listed as a special order...I don't know this company so I cannot vouche for them. Good Luck!

Here is a link that might be useful: longantrees.com

Hope this super late answer will help whoever is looking to buy a BIEWKIEW longan tree. I found it at TOP=TRO=PI=CALS.com in Florida.
They do mail order. Discount for large order or member

I purchased this Biew Kiew last month from the site mentioned above.

Elsy's plants, they don't ship, however. Many interesting varieties of mangoes are available, too. Located out by Ft. Lauderdale.