I have about 200 items coming off of ebay today, about 50 of them have bids and will sell. But the other 150 will need relisted.
This would usually cost me between 20 cents to re-list as Fixed Priced (buy-it-now) listings or 50 cents & up to list as Auction style listings.
But ebay has a one-day sale going on today (May 16). You can list anything on auction (where people bid on the item) for free. You can also add a "buy it now" to your auctions for free.
Here is the ebay announcement: LINK