I confess that the whole issue of prices and international trade boggles my mind. It reminds me of the story of the blind men and the elephant, where "all were partly in the right and all were in the wrong" because noone was able to grasp the whole picture.
My personal belief is that we're all in this together. It's when we forget that point, that it all starts to fall apart. What was the Golden Rule all about? We need to ask ourselves "What are my values?" and then make sure that our actions line up with that. If you have a bounty, share it; if you can buy it locally-grown or from a neighborhood store, do that; shop for a fair price but please understand that "fair" means that everyone along the line from farmer to factory worker to store clerk should be able to have food on their table and a roof over their head.
(Spoken from a Christian perspective but I think it's a concept that is common to other faiths as well.)