Last I checked RR sweetcorn was going for 500.00 for a 80,000 count bag and you had to plant at least 20 acres to qualify to even purchase it under monsanto's agreement. Now rumor going around is that in 2014 you would be required to sign an agreement to plant it so next year it should be more readily available and in smaller quantities.
I'm curious, what crops have the most chemicals applied? what are the nasty non-residual stuff we should really worry about? Frequency of application per crop? My answers would fruits by far in comparison to grains such as corn,beans,oats or wheat. Most trees that produce fruit recieve several spraying a year. One in the winter with copper sulfate to prevent blight, One with the insecticide malathalion before bloom to prevent mites and other insects and usually one prior to harvest with some type of loosener.
Monsanto gets a lot of bad rap. Bayer (the same company researching drugs to save you is also one of the leading companies in insecticides) has done a really good job at maintaining a positive image in the public's eye.