Like most products, the cost of an LED screen for stages depends on multiple things. Size is important - bigger screens tend to have more LED panels and, therefore, cost more. Resolution matters as well - sharper higher resolution screens are more expensive. Different LED components have different qualities, they can be weather resistant for outside accessible stages and can also be more or less expensive based on difficulty of installation. Even the manufacturer and the amount of branding add to the price. In the mid-range, small basic scale stage LED screens start at a few thousand, while large high end scales are generally in the tens of thousands.