These sites are great. Some device I'd like to buy is discounted 3%, and I can see that the manufacturer's old model steadily dropped in price between Christmas

These sites are great. Some device I'd like to buy is discounted 3%, and I can see that the manufacturer's old model steadily dropped in price between Christmas and summer. I know it's better to wait than to bite at the current, laughable discount. In Germany, https://www.billiger.de/ https://www.billiger.de/ https://www.idealo.de/ https://www.idealo.de/ and https://geizhals.de/ https://geizhals.de/ are just three of the many sites that aggregate prices. I know Idealo has a price history that goes back one year. The unfortunate parts: they only list price history for new items, and incorrectly listed discounts (refurb instead of new, different model/color, etc.) stay in a product's price history, so there are sometimes price valleys that should not exist. It would be nice if you could see (on the price history chart) which site/seller had the lowest historical price, since there's more credibility in a listing from Media Markt (probably the largest electronics chain in DE) than from Ebay.