What's a good price for a slightly used black quilted stam??

you could always try a once around and list it with the lowest amount you want to get as your starting bid, and a decent BIN a bit more than that. As long as there's no reserve, if you dont sell it the first time around, ebay will let you relist for free :yes:

Just a bit more on this - from Ebay in case you use any of these features with your listings.

Normally, Insertion Fees are non-refundable. However, if your listing ends without a winning buyer or ends with an Unpaid Item (UPI), you may qualify for a credit by relisting the item. If the item sells the second time, eBay will refund the Insertion Fee for relisting.
This offer only applies to the Insertion Fee and not other fees for options such as Bold, Highlight, etc. After your relisted item is sold, you will be charged the applicable Final Value Fee.

You must use the official Relist feature in order to receive the Insertion Fee credit. Copying and pasting the content of the original listing into a brand new listing, will not enable eBay to track that you are relisting the item and will prevent you from receiving a credit.
 
/\ good info! the nice thing about the relist option too is that you can revise almost everything in the auction. usually the insertion fees are the main bulk of the cost of lisiting on ebay, so it's pretty swell deal.