I once saw a roomful of American women in Paris bidding on a small box of Kraft Mac & Cheese. The bidding went up to about $20 (in today's money).
This summer, I went to a Walmart in the town where my mother lives. It was only July, but I guess after the Fourth is over, Halloween is the next big holiday. Anyway, the Halloween decorations and candy were out in force, taking up almost a whole aisle of the store. I was appalled. (Christmas started in September.)
But of course, if you're an American and want to celebrate your kind of Halloween in Paris, you either have to bring your own things over from the States (you probably won't have remembered), or buy them here. Oh là là! €3,50 ($4) for about ten candy corn!