Where can I buy an orange tree? Who is a reliable seller?

Nothing like home grown fruit
 

We have an orange and a grapefruit tree. This past season the grapefruit tree did not produce any fruit.....both trees were in their first year for harvest. The orange tree had about 17 oranges on it. We picked them and they were the absolute best oranges I have ever had. Juicy and sweet as ever! However, this past jan/feb after we picked the oranges, it started to re bud. The buds on both trees were about the size of a pencil eraser. We had a tree full and both trees budded beautifully. One morning we woke up and noticed that every last bud was off the trees. We were disappointed to say the least. We don't know what ate the buds, but this winter after it starts budding again, we will net it so the buds can't be eaten. We haven't noticed any rodents near the tree at all.