I like the idea of an air freshener more so than sawdust which could have negative health effects. haha
During the holidays there will be an explosion in pine fragrances, and then you can buy them cheap in january when they go on clearance.
I bought the large New Yankee Candles for $7 instead of $30, and one of them was called "home for christmas", and it smells the house like a fresh cut pine christmas tree.