Three in a crate on a shelf in the Camp Golf mess tent. Must be stolen.
An extremely small fresh pear can be obtained in the Ultra-Luxe Kitchen, adjacent to the room where Philippe cooks. There are pears on top of a plate, including one normal sized pear, a medium, and tiny pear. All must be stolen.
A single fresh pear can be stolen from the Nellis hangars, in the kitchen on the brown counter, near some maize and pinyon nuts.
Random Legion troops, from recruits through decanii to assassins, can spawn fresh pears in their inventory, alongside other wasteland foods.