These are in season right now and you can find all kinds of varieties of apple very inexpensively all over the US.
Apple
These are mostly available - moreso in the South US than in the north, but they're reasonable and available.
Grapefruit
Mandarin
Nectarine
Orange
Lemon
These are very much summer fruits in the US and very much past season. If you're going to buy any of these items, they'll be pretty expensive, as we're well out of summer and moving on into winter now.
Apricot
Peach
Honey Dew
These are not common fruits in the US and are generally imported at all times of the year. They're cheaper in the summer, but not by much. Sometimes Mexican mangoes can be gotten on sale, but usually they're just not cheap or easy to find in the US at any season.
Kiwi
Papaya
Mango