Hello, and welcome.
Price can vary, depending on who you adopt from and where you live. Reputable breeders of Maine Coons can have prices that start at $400. In fact, if a breeder asks for less than $400 for a kitten, be suspect that the cat is either not pure bred or may have a health defect. If you would like a pure bred kitten, but not necessarily a show cat, you would still need to adopt from a breeder or cattery that certifies the kitten is pure bred. At the higher end of the price range, $1500 for a pure bred kitten is not unheard of.
If you love the look and personality of Maine Coons (they're one of my favorite breeds, too! : )), you might find a 'look-a-like' that is not pure bred, but looks primarily like a Maine Coon, in a shelter or at a cat rescue organization and you would be saving a feline life, while adopting a cat that will have the qualities you are seeking.
I wish you much good luck and hope you find the perfect kitten for yourself!
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