Garage sales are a waste of time...you normally get a bunch of dirty ass people digging through your stuff and asking if you will take 25 cents instead of $1 for your $100 pair of boots. Or want to know if you will take $3 for your tool box that you have marked for $20. My girlfriends mom has one every summer, and I won't go near the place anymore.
If you don't already, start putting your stuff on ebay. I couldn't believe what people were willing to pay for crap that I had sitting in my garage. I just sold the stock side nets for my RZR on ebay for $50, and the stock seat belts for $60...I was going to throw both away, but the 'ol lady talked me into throwing some stuff online.