All items for sale, or offered must have valid asking prices.
Asking prices must be within reason and must reflect market value. (No asking $1000 for a $500 item, etc.)
This requirement doesn't apply to threads where you're only trading items.
Items in trade posts that mention or accept payment must include asking prices.
No bidding, no auctions.
After completing a sale or trade, you must replace the original asking price with the actual selling price and the buyer's information. This practice serves as a reference for trending prices and prevents double-selling.