One of many marketing techniques used by online sellers is"surge" pricing. Its easy to program in an algorithm to raise the price when the demand goes up. Uber gets pounded on it frequently. Some call it automated gouging but its supply and demand. Same with wood, not enough supply to meet the demand. Those who want the limited supply the most pay more while the one with less need wait. When I go the farmers market and they have the first fresh strawberries of the season I know the seller with the earliest ones will charge more for the few baskets he has, I know if I wait a week or two more sellers will have them and the price will drop.