How much does a gearbox cost?

I'm curious, could you elaborate on the cost of a gearbox? Are there different types of gearboxes with varying price points? Is the cost dependent on the quality, size, or intended use? I'm interested in understanding the factors that influence the pricing of a gearbox and if there are any specific considerations one should make when budgeting for one. Additionally, are there any common misconceptions about the cost of gearboxes that you could shed light on?