[oldjudge]

I have traded crude oil for 28 years. If someone makes a firm offer(or bid) they indicate it as such and they indicate for how long the offer/bid is firm. An example would be that I would sell you X bbls of crude oil at $Y/bbl and that offer is firm for one half hour. Other than that, without the word "firm" in the bid or offer, the price is just considered an indication which needs to be reconfirmed if someone desires to consummate a deal. The card market is certainly less volatile than the commodity markets, but if it was me I would assume that if someone indicated a price for a card to me, and the next day I decided that I wanted to buy the card, I would have to go back and reconfirm the price.