Wal-Mart sold kayaks for about $11 and computer monitors for about $9 on its website Wednesday. It appears the online sales site had a fit of technical price-cutting that was totally unauthorized. The online store has now been shut down. Wal-Mart says that an error caused a number of products to be priced absurdly low or high. “We’re working quickly to correct” it, said Ravi Jariwala, a Wal-Mart spokesman, adding that there would be “intermittent site unavailability” until then. Jariwala said the company hasn’t decided whether it will honor prices for items already ordered.