When is it Too Early to Set Up for or Sell Christmas Items

This morning I went looking for last minute items for my Halloween costume and noticed that stores already had Christmas displays and selling Christmas items. This shocked me as Halloween wasn’t even over yet, and I believe you don’t set up Christmas stuff around the house or stores should start marketing and selling Christmas things at the earliest November 12th which is after Remembrance Day. Now if you want to knock out your Christmas shopping early that is one thing but selling Christmas themed things this early seems wrong to me. This is just my personal take on this, but when do you think is a good time to start setting up the tree and decorations or stores to be selling Christmas to us?  Let me know – Everett