Polybag / exclusives question

dakotahorn · 2013-04-16T15:34:11.000Z

Hey guys I am trying to find out how to get information on exclusive polybags. I have visited brickset and realize you can find some info under theme by year, but I would like to know how I find out about these exclusive polybags before they hit shelves. Great example is Gandalf polybag, which I believe was an exclusive to Target or Walmart. How would I know if more are to be released and where they are headed? Any ideas?