In general, organic products cost about 20% more than simply name brand items. However, the organic grocery cart is nearly 40% more expensive than a cart filled with store-branded products whenever possible. I wish there was more information on what makes up an “average” grocery cart, but I’m guessing it contains a wide variety of items.
Which reminds me of a previous post on which fruits and vegetables you should buy organic. If you value organic but are still on a budget, certain conventionally-grown vegetables retain much higher amounts of pesticides than others. Prioritize your spending with this updated list from Foodnews.org (you can even download an iPhone app with the chart):