Peaches.
I love peaches....but they have to be GOOD peaches. There's nothing worse than taking a big bite out of a substandard peach that's either dry or not sweet or mealy. Costco produce pickers must be pretty strict about the peaches they take because every peach season, Costco seems to get peaches that are an order of magnitude better than anything I find in my other local grocery stores.
So, when they are in season (usually mid July to end of August) - I'll pick up a flat of peaches ever other week from Costco.