I have moved around the US for a few years now and if you are within a reasonable proximity of a military base, there is a website that lets you post items for sale. You do not need to be military or a dependent, it's basically a version of craigslist but is mostly viewed by wives of soldiers either looking to sell or buy, mostly household and kids stuff.

Example:
NC has braggyardsales.com
WA has lewisyardsales.com

The main hub to search for one in your area is bookoo.com, from there you can search for the closest one. I have found that some require a small fee (example, BYS asks us to pay $9 for a HUGE bumper sticker, take a pic of it on your vehicle, and upload the pic) and you get "free membership" for life, which allows picture posting. On LYS, this was not necessary. Some are really hopping, others are like a ghost town, I am not sure what factors determine the popularity.  This will also give an advantage to anyone who can drive onto a military base, since most wives live on post and I have found many good treasures from someone who has just been stationed in Germany/Italy/Japan, etc.
Hope this helps!