Where to buy 20 or 30kw dynamo for generator

Where can i get a 20 or 30Kw dynamo to be used with an engine for making gas generator.

There are a few people who make these generators but a 30KW generator will cost about 220,000 to 250,000.

I can get the engine. i don't know where the dynamos are made. The generator makers are charging 50,000 for a 20kw dynamo. so i guess i can save some bucks if i could get the dynamo and engine myself.