C9 Christmas lights, which are the large, colorful heavy-duty, weather-resitant lights made for outdoor use and are set up in parallel circuits (where if one goes out the rest stay lit), have been around since 1927. They are being phased out in favor of more energy-efficent LED's. Ace Hardware still carries them for now, but one's best bet is to search on eBay for them.
One can find LED Christmas lights at discounted prices from home improvement stores like The Home Depot, Lowe's and Menards. It is best to shop for these lights well in advance of Christmas to get the cheapest prices possible.
Wholesale Christmas lights are available from most large home improvement stores. The Home Depot, Lowe's, IKEA and Menards all have Christmas lights for sale in bulk.
Mr Light specializes in the sale of lights. They sell Christmas lights, solar lights, battery operated candles, rope lights, net lights, and garden lights.
Stores such as Target or Walmart offer a variety of indoor Christmas lights around the holidays. It may be difficult to find Christmas lights outside of the holiday season at brick and mortar stores and an online purchace may need to be made outside of these months.
One can find various Christmas pins for sale online. Some of the Internet sites that provides sales for Christmas pins include Shop411, Pins.Pronto, and Nextag.
There are lots of companies making great outdoor Christmas lights, though Vickerman is often reviewed as one of the most reliable. Make sure the lights you buy are indeed rated for outdoor use, or they could short out if exposed to water.
One can find Christmas cellophane bags for sale during Christmas season at any major retailer such as Walmart or Zellers. Cellophane bags can also be purchased from Amazon.
There are lots of places both on and off line that sell outdoor Christmas decorations. Target and Wal-Mart have a large variety. Sites to try would be Bronners, Christmas Lights Etc, Front Gate, Christmas Lights Show and American Sale.
Post-Christmas Sale
You can find Christmas watches for sale from retailers such as Amazon and eBay. You can get free shipping to your doorstep if you spend over $25.00 on Amazon.
You can find good elliptical for sale on horizonfitness, amazon, walmart.
Whilst many retail stores don't keep Christmas and other seasonal decorations in stock at the stores themselves, some stores do keep such products stored in company warehouses. It is possible to order online such products in various stores such as walmart and target.