The garage sale has never been considered a prosperous business, nor one that provides a good way to make money.  With some quality planning, both in preparing items for sale and advertising, you can earn extra money with a Garage Sale.  The most important thing is that you have ample items for sale.  Unlike something like eBay, where you have millions of peole exposed, a garage sale has a limited audience.  Therefor, you need to have a good selection so you can appeal to everyone who comes.  This will boost your chanes to earn money fast with your garage sale.  Also, making sure that a lot of people know about it is vital.  Utilizing things like craigslist and local community boards to advertise will go far to help.  Plan well, and you will see that a garage sale can make some extra cash for you.