I recently sold several items without any cost through "Instant Auctions".* They sell on ebay, pay for shipping, take the photos, do the write up, handle all the scams from Nigeria, and keep 25% of what the auctioned items sell for.* You just need to be pretty sure the stuff you send them for each separate auction will fetch at least $30 or $40 to make it worth your while.* One way is to group related lower cost items and sell as a lot.
Here is their site with further explanation of how it works:
http://instantauctions.net/
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Brockton, MA 1946-49 * Fort Lauderdale 1950-66 * Northern Virginia (Army) 1967-69 * North Lauderdale 1970-72 * Coconut Creek 1973-87 * St. Louis 1988-89 # Northern Virginia (again) 1990-2000 * Destin, FL 2001-08 * The Villages - Amelia/Hadley