[header] How to decorate your front yard for christmas [title] Buy christmas lights. [step] You can find these on sale in november or early december. Department stores are generally good places to buy lights; some even have breakdowns of the unit price per foot. 
[substeps] If you want to be strategic, go shopping on the day after christmas or after new years. Stores put lights on massive markdowns, well, because the christmas season is over.