In addition to what Ray just said about the relisting insertion fee credit, remember that eBay does not offer the credit to Fixed Price listings anymore (with the exception of an Unpaid item,) but auction-style listings can still get the credit.
"Relist Credits Ending for Fixed Price Listings October 22
As you know, we recently reduced Insertion Fees for Fixed Price listings to just 35 cents for a full 30 days, and just 15 cents in Books, Music, Movies & DVDs, and Video Games. As a result, starting October 22 we will no longer be offering Insertion Fees credits when Fixed Price items are relisted. Credits will still be issued for unpaid items and are now being extended to single quantity Store Inventory Format listings if there is an unpaid item. Note that relist credits for Auction-style listings will continue."