Don't you have to list a price for all items in a classified?
edit: copied from geekhack classified rules - All items for sale must include an explicit price. If you are unsure how much an item is worth, you may ask in the Price Check thread. If you are not satisfied with that option and prefer an auction, you can always list your items on eBay and similar sites. It is the responsibility of the seller to determine the exchange rate if the transaction includes multiple currencies.