Buy bulk LEGO
LEGO is one of the most versatile toys ever created. Many parents and grandparents grew up building with LEGO bricks and are now watching their children and grandchildren build with the same elements. The basic design of a LEGO brick has remained compatible for generations.
Unfortunately, LEGO sets can be quite expensive. Purchasing elements as part of new or even used sets puts the price at $20 USD per pound or more. However, purchasing bulk used elements by the pound can be much more affordable.