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Although I find this method to be simplest for my own peace of mind, I fully understand that there are still many people who rely on commercial shops for their fresh, raw produce. For those who cannot deal directly with farmers ALL of the time, my advice is to use the Environmental Working Group's "Dirty Dozen, Clean 15" list as a reasonably acceptable go-to buying reference:
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Another thing to consider is the fact that most "Dirty Dozen" (chemical/pesticide-laden) items are available at the majority of farmers markets across the US (& beyond). I would be most inclined to buy these items from trusted local farmers, and only "Clean Fifteen" items considered for purchase in shops.
Please feel free to comment with any thoughts on this. All insights are welcome & encouraged!