BudujSprytnie collects prices of building materials every day from major Polish DIY chains: Castorama, Leroy Merlin, OBI, Bricomarche, Bricoman and more. It matches identical products across stores, so you instantly see where cement, drywall, insulation or paint is cheapest right now. Price history shows whether a promo is a real deal. Plus cost guides like "how much does a 100 m2 house cost in 2026", based on real store prices. Free, no account needed.