It's 10 cent listing day on eBay today for fixed price auctions, also known as Buy It Now (BIN).
I know of at least two ways you can take advantage of the discount.
If you have multiple quantities of the same item you can include them all in one auction and not have to pay for listing the increased quantity.
Another advantage is for higher priced items. If you have an antique vase, lamp, train, etc. that you need to list for big bucks, it's only going to cost you 10 copper coins.
Now that I think about it, you may not want to list an antique at a fixed price, instead you want there to be a bidding frenzy, it will still work on those items you want to list at a higher fixed price.
Let me know if you have any questions on this . . . Scott