Tip 2: Get up early or go to bed lateWhat many people don't know: Prices vary not only depending on the online seller, but also on the time of day. Michael Stempin from "idealo" explains: "The best time to shop online is at night. Especially in the time before breakfast you can't go wrong." But why do prices in online shops change at all? Dynamic prices are relatively normal, according to Stempin: "Retailers react to market conditions, supply and demand - or the competition adjusts a price and then the retailer reacts to it." The dynamic prices play the biggest role in electronic devices, as the expert reveals: "The prices change up to four times a day."