Finding conventionally grown produce in organic sections has happened to me so many times. I am usually in a hurry, I run into the shop, head straight for the organic section and pick up the first nice looking tomato that I see. Then I quickly glance at the PLU code and I find that the tomato is actually not organic. Smaller shops I find to be the worst culprits. It also pays to be careful in Whole Foods as their fruit and veg can be both organic and conventionally grown. Our local Whole Foods is pretty good at labelling these where possible but sometimes the labels get mixed up or moved slightly and it is difficult to work out what is organic.