So where do we usually get Flavanoids, basically from colorful vegetables! You are eating your vegetables right? I really don't like my vegetables but I eat them.
Anyway researchers have found that quercetin and kaempferol, two flavonoids, in dried tomato samples. They found that levels of quercetin were 79% higher, and kaempferol 97% higher in the organic tomatoes, compared to the non-organic ones.
So don't pass that organic isle just because too expensive. It is healthier to eat organic food, always as long as the farmers, producers have followed the guidelines.
You can read the new scientist article "Organic tomatoes have more antioxidants" based on the research conducted at the University of California, Davis.
The research and study, is also published in the Journal of Agricultural and Food Chemistry, (Abstract only! The complete paper could be had after registration at the site)