Greetings: Who is the best Online Nursery to purchase a Fugi Apple Tree?
I assume you meant Fuji, not Fugi apple.
Reputable nurseries like Adam County Nursery (unfortunately, their Fuji is sold out), Cummins, Raintree, Grandpa Orchard nurseries carry Fuji.
Plase keep in mind there are a number of Fuji strains. Do you know which one you want?
I attached a link of a previous thread that discussed Fuji strains for you.
Here is a link that might be useful: Fuji apples