I hope you buy one and plant the top, it will take a couple of years to get fruit but well worth it.
Twist the top off of the bought one and set it in the shade for 3 days, or on your countertop, peel off the bottom leaves about 2 inches up, and plant in well draining soil. Water from the top every 3 or 4 days, that is where they get water, not the roots.