Christmas trees normally go on sale during the later part of September and early October. Christmas items are known to go on sale before Halloween and Thanksgiving.
This white Christmas tree is on sale for $369 http://www.christmaslightsetc.com/p/7.5%27-Jack-Pine-White-Tree-White-Artificial-Christmas-Trees--20714--191.htm
Online buying options for artificial Christmas trees are more plentiful than before. Sites like Wayfair, Amazon, Tree Classics, and Lowe's all have these items in stock during the holiday season.
Live Christmas trees can be found locally at tree farms. Artificial trees can be found during the Christmas season at many stores, including Walmart and Target. Off season the best place to purchase a Christmas tree would be Amazon.
Christmas trees sales are so that people can buy cheap Christmas trees in the run-up to Christmas day. The trees sold in these sales are often cheaper than what you might find in your average shop.
Garden centres can be a great place to go and find Christmas trees on sale. They come in various sizes, so you can get them big or even small to suit the space that you have for one in your home.
I searched online for this and it seems that they can cost from $120-1500. This seems a bit expensive, but there is a artificial tree sale with free shipping at treetopia.com. I think it depends on how tall you want it. If you want a 7.5 ft. tree, then around $500 is the price you would have to pay.
Cookware typically goes on sale around the holiday season. Starting in October, stores begin putting cookware on sale in time for people to buy it to prepare meals at Thanksgiving and Christmas.
The internet would be the best place to buy an aluminum Christmas tree. Stores such as Sears or The Bay might carry these types of trees during the holiday season if there is a demand.
Post-Christmas Sale
Typically Christmas decorations go on sale as soon as Halloween is over. In some stores, Christmas decorations go up as soon as the school year begins. If they aren't out by September or October, they will definitely be up right after Halloween.
Target is a great place to find cheap white Christmas decorations. www.christmas-trees-wreaths-decorations.com also has a wonderful selection of white christmas decorations to buy online.
Currently eBay has listings for snowflakes, mistletoe, candles, Father Christmas, Christmas trees and Reindeer. Because eBay is an auction site the availability of these designs may vary.