30 years ago the 'Pole Pig' transformers were advertised for sale a fair amount. These were from the utility power companies and usually removed from the oil bath can. Some were 2400 volt out and others at 4100 volts out. I believe the smallest was a 5KVA (5KW) and would power about anything. Shipping was usually more expensive then the transformer itself. I have not seen any for sale for years.