The cost of a power transformer can vary widely depending on several factors, including its capacity (in kVA or MVA), voltage class, cooling type, physical size, design specifications, manufacturer, and location where it's purchased or installed. Generally, power transformers are custom-built for specific applications and thus prices are not standardized.
For smaller distribution transformers, costs might range from a few thousand dollars to tens of thousands of dollars. Larger power transformers used in substations, which can handle hundreds of MVA, can cost hundreds of thousands to millions of dollars.
Additionally, factors such as transportation (especially for larger units which may require special equipment for transport), installation, and commissioning can add to the overall expense.
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